History The FM12 was introduced in 2000 as an intended replacement for the standard issue in service from the 1980s.New Listing LOT OF 3 AVON CBRN-FM12 GAS MASK CANISTERS WITH MANUAL/ BAG. Find great deals on eBay for avon s10 gas mask. It was ultimately made for military, police, and security forces in the United Kingdom, the United States, and is the current military issue for the Dutch, Danish, and Norwegian military. The FM12 was developed by AVON Rubber in the early 2000s and uses the S10 style structure.