The Zenith Defy El Primero 21 is a very unique piece, its skeleton design is amazing. The 44mm case feel like nothing on the wrist because of the titanium case. It has box, 2021 card, extra links, manual and a nice book about the history of the Zenith brand I added to the set. It has a high frequency 36000hz movement with a 50h power reserve. Great condition very lights signs of wear. It was just checked by Zenith because of my ignorance about this model. I drop it at my Zenith dealer and it was sent to Zenith because I noticed the power reserve never goes down and they check it and everything on the watch was perfect. The power reserve indicator is only for the chronograph hand so it is full most of the time. This piece has two independent high frequency escapements one beating at 50hz for the chronograph function and 5hz for the timekeeping. Thanks for considering us as the source for your next timepiece. Miami FL