I was recently given an older Seagull TLR from a relative who lives in China. I have not had a chance to shoot with it yet, but I believe it is a 4B-1, with the manual red window film advance and a mask for 6x4.5. It has a metal body and is very heavy. To me, it seems like a quite robust and solidly constructed camera, although pretty much everything I've read about Seagulls would seem to indicate the opposite! I wonder if the reliability issues are limited to the newer models being sold today? Or maybe this one will fall apart once I actually attempt to use it