Meanwhile, there’s some evidence that Worldwide distributors hated the inconsistent and sometimes illogical numbering devices of their Swiss overlords. When in doubt, Choose a Serpenti in two-tone metals—a modern, placing watch that should hug your wrist like a 2nd skin. YYZ, where XXX signifies the movement, YY indicates the case https://www.watchesworld.com/a-history-of-watch-reference-numbers/