Avon FM12 APR Gas Mask Size 1. Avon FM12 Gas Mask, Size 1. Size 1 fits Large sized faces. Comes with one sealed in box MSA CBRN CAP 1 filter. (note: the last picture shows Sealed filter box, a wrapped filter as it comes in the box and a filter out of the package for reference only). Used/issued but in Very Good clean condition. Lenses are super clear. These were tested and stored in gear bags before being replaced with new units. Listing and template services provided by inkFrog.