I have a 1937 model,6.5x14-8lug,threaded imperials,square center bead,bearing edges fold back like an older black beauty,or ludwig standard.one piece shell! Best snare drum I even owned! I have had 2 now,and this one is my "go to"snare. It being an 8-lugger really opens up the NOB tone and allows the drum to sing all that warmth...enjoy your snare,its a great one...cheers!!! flowers2