I have only 6 watches (not counting Moonswatches on the way), and 3 of them are Panerais. Here's the oddball in my collection: a 1974 GEN Zlatoust 191ChS, 60mm diameter without the crown, 73mm with it.
The watch was made for Russian "hard hat" military divers, who needed to check the time underwater and was worn with an olive colored, rubberized strap on the forearm. The watch has fixed bars, so I had to sew the custom-made leather strap around them.