The Yashica FX-3, FX-3 Super and FX-3 Super 2000 all have the same mechanical shutter, with the later one going all the way to 1/2000 sec.

The FX-D and Contax 139 have nearly identical shutters but they are electronically controlled. I suspect some of the mechanical parts are the same as the FX-3. I know that the mechanical mirror box mechanism is the same or similar on all 5 cameras.