I got thought we could try to name as many body squibs or squib-like devices in movies released prior to 1970 as we could. All are blood squibs unless I note otherwise. I'll start:Movies I've Seen:
The Magnificent Seven: when Charles Bronson gets shot in the shoulder during the final shootout
The Great Escape: 1. When Angus Lennie gets shot trying to climb the fence (non-blood). 2. When David McCallum makes the Gestapo agent shot himself with his own pistol (non-blood).
The Wild Bunch: duh
Bonnie and Clyde: 1. not a squib exactly, but blood can be seen splattering out of the head of the clerk that Clyde pistol-whips. 2. When Clyde gets shot in the arm during the shootout where Gene Hackman bites the dust. 3. The ending, obviously.
Where Eagles Dare: numerous times
Hell to Eternity: numerous times
Khartoum: when an Egyptian soldier is shot during the cattle raid battle
Once Upon a Time in the West: when Henry Fonda blows away Wobbles (may not have been squibs in the strictest definition of the term).
Hell Is for Heroes: two on Steve McQueen's back when he gets shot during final battle.
The Sand Pebbles: 1. when the dude who kinda looks like Ernest Borgnine gets shot during the boarding action (may not have been a squib, exactly, but blood does appear on clothes when gets shot). 2. when Richard Crenna gets shot. 3. when Steve McQueen gets shot.
The Professionals: when one of the bandits gets shot in the waist by Burt Lancaster during the final shootout
You Only Live Twice: I was probably just seeing things, but did I see some squibs on somebody during the final battle?
Butch Cassidy and the Sundance Kid: 1. there's a non-blood one of the owner of the mine they're going to work for. 2. there's some non-blood ones on the Bolivian bandits they shoot. 3. during the final shootout, at least one Bolivian soldier has a puff of dust in front of him after being shot, which could indicate a non-blood squib.
Major Dundee: I don't think there were any real squibs, there were a couple of incidents that tried to recreate the effects of one. 1. when James Coburn blasts an Apache at the beginning, it looks like somebody's throwing blood on the guy from off-camera. 2. one of the first Union soldiers killed in the nighttime Apache ambush in the river has some blood splatter on his shoulder area, but it's not quite clear if it was a squib or just some blood chucked onto him from offscreen like the death mentioned in #1. 3. when Coburn shoots his Apache during the final battle with the Indians, some blood appears on the Indian, but when going frame-by-frame it almost looked like the shotgun shot some fake blood on him or something.
Battle of the Bulge: 1. there's a non-blood one on the wounded American soldier who's finished off after the Malmedy Massacre. 2. there's a couple of non-blood ones on the chest of the Nazi commando disguised as an American MP that Telly Savalas mows down at the beginning of the fuel depot finale.
Bullitt: 1. when the assassin blasts the cop in the leg and the witness in the chest in the hotel room. 2. it's possible that a squib was used on the final bad guy Steve McQueen kills at the airport, but even after examining the scene frame-by-frame, I locate it.
Ma Barker's Killer Brood: a couple blood squibs appear on the chest of an FBI agent during the final shootout.
Return of the Seven: two during the final shootout when one good guy gets shot and when the main bandit gets shot.
Cast a Giant Shadow: an Israeli guy who picks up a runaway chicken gets shot in the chest during the convoy ambush scene.
The Green Berets: 1. there's several on a group of Viet Cong who get mowed down by an airplane's Gatling guns. 2. there's a non-blood (I think) one on the chest of the first guard that gets shot by the suppressed/silenced pistol during the raid to capture the general.
How the West Was Won: during the brawl with the river pirates in the first act, we see a blood squib for some guy's exit wound.
Play Dirty: one of the guys tangled in barbed wire in the final battle has squibs on his chest.
Casino Royale '67: doesn't really count as a squib, but Orson Welles gets shot in the bare forehead, and blood oozes out.
Never So Few: during the Christmas battle, the native next to the gong has a blood squib on his back.
Lost Command: probably wasn't a squib, but you can see a small puff of dust on George Segal's chest when he dies at the end.
The St. Valentine's Day Massacre: some non-blood squibs on the people who get shot during the title event
Hell's Angels: 1. a pilot who gets shot in the arm has blood coming out (since they used live ammo back in the day, it may have been a dummy with blood in it being shot). 2. when the guy gets shot in the back at the end, a bullethole appears in his clothes, but it may not have been a squib.
El Dorado: when James Caan blasts Pedro with a shotgun (I think they may have been non-blood squibs ones).
Along Came Jones: doesn't actually contain body squibs, but does have two interesting instances of early effects simulating bullet hits. 1. when Gary Cooper gets shot in the arm, the clothes on the left side of his body reacts in a manner similar to what it would look like if he got hit by an air cannon or something. 2. when the bad guy gets shot at the end, a bloody hole appears in his bare forehead. Not sure how this effect was achieved.
Commandos: may have seen a blood squib on the shoulder of the charred Italian guy during the final shootout. Not sure, though, DVD quality was poor.
The Mercenary: blood squib appears on upper arm of soldier who gets shot by machine gun during the bank heist
Goldfinger: in Q's lab, a guy has squibs in bulletproof vest (non-blood ones, obviously)
The Longest Day: 1. the German soldier who wrestles with the French lady in the river has a (presumably non-blood) one of his back when he gets capped. 2. the first Allied paratrooper killed during the scene where they frighten an old lady going to the outhouse might have had a (presumably non-blood) squib on him when he gets submachine gunned, but it's shown from too great a distance to say for certain. 3. Red Buttons has an explosive charge (non-blood) in his shoe when it gets shot during the disastrous paratrooper landing. In the same scene an American paratrooper has smoke appear around him when gets shot. Not exactly a squib, but close enough.
Warlock: when Henry Fonda is nicked in the arm during the main street showdown (non-blood)
Only the Valiant: 1. when Lon Chaney, Jr. gets shot in the shoulder in the pass before Gregory Peck dynamites it 2. when the bugler kid gets shot in the shoulder during the final assault
The Music Box Kid: when the gangster on the staircase at the end gets shot there appears to be a tiny puff of smoke similar to those emitted by squibs. That being said, I couldn't locate any "bullethole."
Kiss Tomorrow Goodbye: when James Cagney is shot the second time during the finale, it looks like some special effect (probably not a squib, though) was used to simulate a tiny bullethole (barely noticable).
The Killers (1964): not actually a squib, but when John Cassavetes gets shot at the beginning, he smears some blood on his face with his hand.
The Scalphunters: probably not a squib, but a puff of dust can be seen on a scalphunter's chest when Burt Lancaster shoots one them when they try to bait him with the furs.
4 for Texas: when Charles Bronson gets shot in the arm by Frank Sinatra in the restaurant (non-blood).
Hangman's Knot: 1. not necessarily a squib, but in the opening shootout you can see a little bit of blood splattering a soldier's face (probably from offscreen) in a manner that makes it try to look like he was shot in the face. 2. there's a blood squib on the back of the guy who sent the guys on the mission to steal the gold when Lee Marvin shoots him. 3. may not have been a squib necessarily, but a bloody bullet wound appears on Lee Marvin's arm when he's shot by the kid when he tries to shoot Randolph Scott.
Yellowstone Kelly: when Warren Oates is killed during the final battle, you can see a small, bright red ball of paint being flicked onto his forehead from a guy offscreen. Not a squib, but close enough.
The Manchurian Candidate: 1. not a squib, but when Laurence Harvey shoots one of his own men during the brainwashing session in Manchuria, we see blood splatter all over a picture of Joseph Stalin. 2. a bloody bullethole realistically appears on James Gregory's forehead when gets sniped at the end (probably not a squib, though).
Bataan: 1. may not have been a squib exactly, but when Barry Nelson gets shot in the helmet while on top of the tree, you can see some smoke puffing out of his helmet (no blood). 2. once again, this may not be a squib exactly, but when Thomas Mitchell gets blasted by the machine gun in the tower in the big battle scene, you can see a lot of smoke puffing out of his uniform (no blood).
Castle Keep: 1. one is shown on the arm of the guy who shoots down the plane. 2. there's one on the shoulder of the soldier armed with a BAR during the first attack on the castle. 3. one on Burt Lancaster's shoulder when he's defending the castle wall with the fifty-caliber machine gun.
Taras Bulba: probably not a squib exactly, but when Yul Brynner shoots Tony Curtis, you can see a hole appearing in Curtis' armor (no blood).
Villa Rides: 1. appears to be a blood squib on one of the Mexican soldiers on horseback Yul Brynner shoots during the first battle. 2. one of the men Charles Bronson executes after the first battle appears to have a squib (not sure it was a blood one or not) in his shirt. 3. also during the execution scene, the guy who gets shot in the back climbing up the wall appears to have a red dot appear on his shirt (not sure if it was a squib exactly).
Apache: during the brief ambush scene at the entrance to the abandoned mine, a small, bloody spot can be seen appearing on the cloth on the forehead of the guy Burt Lancaster shoots. It probably wasn't an actual squib, though.
The Devil's Brigade: 1. not a squib exactly, but when the soldiers take over the village, some blood can be seen splattering out of a Nazi tank crewman's collar area when he's stabbed with a knife. 2. there's one on Jack Watson when he gets shot.
China Gate: probably wasn't squibs exactly, but when the former French traffic cop is shot during the jungle ambush, you can see lots of smoke/dust puffing on him.
100 Rifles: 1. when Raquel Welch shotguns the first Mexican soldier during the scene where they take over the train. 2. when a young rebel is shot while charging the train during the same scene.
Tobruk: 1. there's several squibs (at least one a blood one) on Liam Redmond when he dies. 2. there's some non-blood ones on Jack Watson when he dies. 3. there's one on George Peppard's shoulder right before he's killed. 4. the first Jewish-German soldier to die after Peppard has a small puff of smoke/dust on his chest, which may or may not've been caused by a non-blood squib or squib-like device.
Battle of Britain: BCap reports that there might've been some squibs in this one. It's been years since I've seen it and wasn't a squib-counter at the time, so I can't remember any specific scenes.
His Majesty O'Keefe: there's a non-blood squib on the back of the German officer Burt Lancaster takes cover behind during the battle where he retakes his village.
Birdman of Alcatraz: a squib is shown on the rifle-armed rebel when he's shot during the Battle of Alcatraz scene. Sparks can be seen coming out, but I don't think there was any blood.
None But the Brave: there's one on the Japanese soldier with the sword during the final shootout.
Bitter Victory: 1. during the raid on Benghazi, a British commando gets shot and some pebbles (I don't know what color they were since the movie's black-and-white) shoot against wall, apparently coming from the soldier's body. I really don't know for sure what the filmmakers were getting at here. It wasn't a squib and the pebbles (simulating drops of blood???) just bounced off the wall. 2. once again, it's not a squib, but the scorpion bite on Richard Burton's bare leg gets stabbed with a knife and blood realistically oozes out of the bare skin. Pretty gruesome for a 1957 film!
Death Rides a Horse: there's a non-blood one on Bill's sister when she's shot by the bandits in the opening scene.
The Great Silence: 1. when the bounty hunter's thumbs are shot off in the opening scene, it appears to be done with squibs (and at least one with blood). 2. not a squib, but a guy's thumb can be seen being shot off in a flashback scene.
Beach Red: 1. when the Japanese sniper who uses the dummy is killed, it kinda looks like the aftermath of blood squibs on his chest, with puffs of smoke still the air when it cuts to him. 2. during the brawl when they go to capture some Japanese, you can a close-up of a blade piercing clothes resulting in blood spilling (not a squib, close enough) and the shirt of a Japanese soldier shot at nearly-point-blank range by a carbine reacts in a way similar to that if it was hit by a bullet (not sure if it was an actually squib, though). 3. during one of the final melees, there's another close-up of a blade bloodily cutting clothing (once again, not actually a true squib).
Earth vs. The Flying Saucers: not really a squib, but when the first alien is shot by the American anti-aircraft gun, there appears to be an explosion of sparks and whatnot on his chest area.
Heroes for Sale: during the street brawl between the poor and the police, the side of a woman's face suddenly has blood appear on it (as if some special effects guy is splattering fake blood on her from barely offscreen). It's unlikely (although not impossible) that the wound was caused by a gunshot, but I still think it's worth mentioning.
Spartacus: no squibs, but blood splatters on Laurence Olivier's nose when kills Woody Strode and, in the big battle scene, Kirk Douglas lops off a dude's arm and blood can be seen blood squirting out.
The Undefeated: when John Wayne shoots the head bandit after trying to negotiate with him, a puff of smoke/dust comes from the latter's chest area (a good chance it wasn't a squib).
Merrill's Marauders: during the jungle ambush scene, a Japanese soldier hanging upside down is shot and dust is shown being kicked up by squibs. I could not tell if the squibs were on the actor or the scenery.
Night of the Living Dead: there's some on the zombies that get shot.Movies I Haven't Seen:
The AOBG AMB for The Black Klansman reports blood squib use.
Branded to kill (1967) (thanks to Gabe)
The main character accidentally shoots a civilian resulting in a squib.
And at the end where he shoots Killer No. 1 blood squirts out his head.
"All the Young Men (with Sidney Poitier and Alan Ladd) that featured a guy who got his neck slit by an enemy soldier, and blood flowed from the wound (although I don't think it was a squib). There may have been non-blood squibs earlier when Sidney Poitier opened fire on some enemy soldiers (I think the squibs were on one of Poitier's men, who was shot by Poitier while being held captive by the North Korean/Chinese troops)." - BCap
"Also, I just saw Fixed Bayonets!, and it looked like there were a couple of squibs used (non-blood types, though). I can't be 100% sure of this though, but it did look like it." - BCap
There's plenty of gore effects in Jigoku (thanks to BCap).
"There's a blood squib in the 1968 film Vengeance, when Richard Harrison notices a guy sneaking up on him, so he shoots him with his own custom sawed off shotgun, blasting his chest, with about 7 or 8 squibs." - Farmer_J
This article: http://www.brightlightsfilm.com/37/bleeding1.php
talks about the evolution of cinematic violence. It claims one of the very first body squibs was Run of the Arrow (1957), but also claims there's an arm squib in Hell's Angels (1930). It also mentions squibs in the pre-1970 movies: Viva Maria and Anzio.
Wikipedia incorrectly claims the first movie to use a body squib was Pokolenie (1955).
There also appears to be body squibs in the spaghetti western Massacre Time (thanks to Rutledal's killcount video).
Love Me Tender: when Elvis shoots his brother in the shoulder (thanks to stefan18901)
The book Classical Film Violence: Designing and Regulating Brutality in Hollywood Cinema, 1930-1968 by Stephen Prince talks about a scene in Show Them No Mercy! (1935) where a character is shot several times with a submachine gun and having bullet hits on him "simulated by inked plugs fired at a transparent screen in front of actor Bruce Cabot" (page 119). Not truly squibs, but still pretty damn impressive for such an old flick.
The same book mentioned above also says there are squibs/squib-like effects used in Pride of the Marines (1945) (page 157).
If anybody else has anything to contribute, I'd love to see it.