Ok Guys something i don't know.i have this S/L r.k. shell its from the 30's-40's the ring on the inside of the shell is about 3 1/2" wide,shell seems to be a one ply shell.The shell is 12 headx14 deep it had 6 lugs top and botttom..What is it? I checked the catalogs i cannot fine a drum like it....Mikey