Dr No[Moderator Omega - Wristscan]
37722
Reference 2486, along with 2471, 2606, and 3944, showcased Omega's cal 381 triple-date moonphase movement . . .
. . . from the late '40s thru mid-'50s. These were designed and manufactured in-house, unrelated to other similar movements common at the time.
Not my cup of tea; Andrew D was a fan, though. They're difficult to collect as so many have been re-dialed. Why, I don't know. But there seem to be an awful lot of refinished Cosmic dials around.
Best,
Art