from your pics it does look like a S/S, did you only get the shell? it is most certainly a brass model with the crimped snare beds, that is what it's called not rolled over. a transbadge/ brass model = big dollars. look at the pic of my 20's ludwig brass model same snare beds as yours, crimped!!
Thanks for the picture of your 1920's brass snare. WOW!
Mikey777 has confirmed that my snare is a real S/S Transition badge shell. Now I have to decide whether to try to find/buy all of the parts or what? Decisions, decisions!!!