gas mask

I started working on putting together a display of the mask from the 1973 George Romero movie The Crazies. Im pretty sure I got the gas mask right (WW2 era British MK5). However, I totally failed at identifying the canister. Can anyone help me identify the filter being used in the film? Thanks!

Hey all, short introduction. I've always wanted to do a Metrocop build. Been a dream build of mine for a few years. I periodically check here for any new builds, most recent being made by since banned member msleeper. It was a decent build, no doubt. I have pored over the various builds. There...