I once owned a Salyut-C from Sam Sherman. It had the metal shutter. It also had a small pinhole in the shutter (which Sam warned me about before I bought it). I too loved to play with it, cocking it and firing the shutter to hear the clockwork sounds of the mechanism...until the shutter ripped.

Ah well, one quick trip to NY for repair (and a few calls starting with "Hello, this is Eddie from Camera shop") and it was great. I wasn't really using it, so I passed it off to my brother.