Modder help would be greatly appreciated. I have a Paso MBW 1665, and I've given it to my watch modder for Clark T-39 superdome installation.
He felt that the Clark will not fit. It appears the original crystal is pressed in, without a plastic gasket. He said that he might be
wrong, because sometimes those are difficult to actually see. One other hitch is that he measures the original crystal diameter at 30.2mm, where he measures the generic to be 30.4mm. Consequently, he did not remove the original crystal from the case.
He mentioned that he has replaced genuine crystals on vintage GMTs and Subs. They slip over a metal ring, and then an outer ring is pressed fit over that securing the crystal between two metal sides.
Thanks so much for your help!