I think I can make out a badly stamped '42' on the butt socket, too. IIRC Faz early war production had the manufacturer details & date crudely hand stamped onto the butt socket as has the OP's rifle. Sometime mid-war they changed to neatly, but very shallowly engraving the details on the receiver side wall flat below the folded rear sight. I've certainly seen 1943 dated rifles with this latter style of marking.