here's a pic of a rear drum. Sorry it isn't of the whole drum; I took the pic documenting the FoMoCo on the drum as original equipment. Next time I have the wheels off, I'll take better pics.
BTW, my car came off the assembly line 9/11/64 (San Jose) with many of the early (64 ½) parts on the car, so I'm betting these drums are what was on a true 64 ½
Hope this helps.