The Frederique Constant Slimline Perpetual Calendar Manufacture FC-775G4S6 is a superb Swiss Made watch with an in-house Frederique Constant FC-775 movement. This is an incredible mechanical (automatic) movement with a perpetual calendar with date, month and day hands and a moonphase. This marvel of engineering also accounts for for leap years. Movements with these sorts of complications are more commonly found in watches that are several times the price of this Frederique Constant.

Aside from the technical aspects it's also a very beautiful, stylish and classy timepiece that has tremendous wrist presence. 

Stunning, horological pedigree and quality - what more can you wish for?