This is just a guess, but Omega might be part of the Swatch group umbrella along with Breguet, Blancpain, and of course, GO. Some of the proprietary date mechanisms might have been shared between companies.
To answer Dr. No's request...I got the GO because I like the combination of exclusivity, finish, and quality of GO watches....I love when someone comments on how much they like the watch I'm wearing, but never heard of it.....
Thanks....btw, can anyone help me insert photos on this forum? I'd love to post a pic...Anyway, I got the SS GO Senator with moonphase and date with black LA alligator strap.