Dr No[Moderator Omega - Wristscan]
34923
Correction: even though I've never seen a SM chronometer with a cal 501 movement, . . .
Apr 27, 2019,13:16 PM
. . . MSNWatch, who used to post here, reported owning one many years ago. So if you find a cal 501 ref 2989, don't dismiss it out of hand. It should have chronometer marking on the rotor.
Art