I can’t find any information about these online; two eBay auctions are all there is (seemingly) about these Coca-Cola bottlecaps, featuring different missions from the Apollo program. The mission insignia appear on the underside of the cap.
Updated: Phil Mooney, the Coca-Cola historian/archivist says:
Danielle – You’ve posted photos of [some] of 15 Coke bottle caps featuring different space missions (including Apollo 1, Apollo IV and Apollo VI). The promotion was done in the early 1970s (and had ended by 1972). The space mission set of caps was only done regionally within the United States, though there had been other bottle cap promotions (for football, baseball, cities of the world) that were conducted throughout the U.S.
So there you have it. Now we know!
(More images below)
The images below are the strangest, in my opinion: they feature Apollo 3 and Apollo 5, neither of which flew men into space — Apollo 5 was an unmanned test of the Lunar Module in space, Apollo 3 was skipped entirely after Apollo 1 (the count goes from 1 to 4. Apollo 7 was the first manned mission after the Apollo 1 disaster.)