Any opportunity to refresh this thread.......just got this today and took a few pics before sending it to get serviced. It's no slouch alongside other watches. 14777 1961 37mm, serial 18mil 561
it'll be either a cal 561or 564 if it's a quickset date, pull/push the crown to change the date, it's a 564 if you move the pointers back through 9 and then back to 12 to change the date, it'll be a 561 and if you haven't read Desmond's Connie blog already - that's where you want to be http://omega-constellation-collectors.blogspot.co.uk hope that helps luck lady.....
According to your advice, it seems to be a 561. Thank you very much for your help Peemacgee . By the way, I will read carefully the blog. Regards.
Omega Constellation Manhattan "Observatory" with Cloisonné Enamel Dial. Limited and numbered edition of 50 pieces, crowning the rejuvenation of the Constellation line. Produced on 7th of November 1996, delivered to USA.
The most recent and oldest addition to my small family of Constellations: 1958 SN 16xxxxxx Ref 2852-9 SC Cal 505 stainless case dome dial white gold arrowheads gold medallion beads of rice bracelet Thanks, @JohnSteed !!