I've recently grabbed a 10" Tele-Optar that came in this huge Graphex shutter, I've seen them listed both ways like Mr. Fromm said.

The jury is still out on mine, glass is in great shape but I haven't developed the test 4x5 sheets yet. Staring at the GG with a loupe is nice, though, the f5.6 is nice and bright to work with.