Caliber 8651 Annual Calendar with Moonphase, NYC 2006

The integrated double push button clasp ...
is also a feature that one does not want to miss once one had experience its ease of use. Taking off the watch is easy on the fingers, something you start to cherish once you get a bit older and clumsier. Interesting also that the watch back is removable and sports notches as found on most watches with a water resistance of 100 meters. Earlier Eco-Drives had a once piece case that forced a service person to remove the watch movement through the front after having lifted off the crystal. I think Citizen again decided for logistics reasons that a removable screwed case back would make the watches much easier to service.