If you look even more closely, you will notice that the dial pattern is a bit different too. The squares are a bit smaller than on the current models of the Royal Oak series.What didn’t change, is the size of the Audemars Piguet Royal Oak Offshore 25721ST.OO.1000ST.07 Mens Watch, the lack of a second hand, the movement caliber (2121) and the thin case. The thin case is only possible because AP still uses the caliber 2121 movement, which has a height of only 3.05mm thick, including the 21ct gold rotor. The screws in the octagonal bezel are still made out of white gold, as are the minute and hour hands. Below a picture of the movement, dis-assembled (without rotor) not even 3mm in height. Picture credits to Matthias S of the German R-L-X forum.I think a lot has been written about this movement already, also used by Vacheron Constantin (caliber 1120 in their ’222′) and the Patek Philippe Audemars Piguet Royal Oak Offshore 25721ST.OO.1000ST.07 Mens Watch Nautilus (caliber 28-255), all based on Jaeger-LeCoultre’s caliber 920.
Just before year-end, on the 24th of December to be exact, I traded my Audemars Piguet Royal Oak ref.15300 for a 15202ST (or 15202ST.OO.0944ST.02 in full). Although I was very happy with my white dialed Royal Oak 15300, the 15202 ‘Jumbo’ remains to be the original Royal Oak in my opinion. The original G?ɬ©rald Genta creation of 1972 still lives in the current Royal Oak collection, bearing reference number 15202ST. The original Royal Oak ‘Jumbo’ is pictured below, with reference number 5402.As you can see, the hour markers are a bit different than the Audemars Piguet Royal Oak Offshore 25721ST.OO.1000ST.07 Mens Watch current ‘Jumbo’ and the AP logo changed position.
