So the new one has a naiad crown, but the original didn't? Is it just me or are the engravings on the new one's bezel a bit exaggerated compared to the original? I would trade my '83 Speedy for either of those, if the opportunity arose elsewhere, that's a...
Some of the 2915 (and also later series) had Naiad crowns, and some did not. It is, to my knowledge, not entirely established which ones / on what criteria they would be fitted with Naiad or not, one theory is as simple as the possibility that Omega used ...