I saw a Royal Oak Offshore today for a real good price. Almost a too good to be true price so I thought I'd ask some questions. It is a 25721ST.OO.1000ST.08
It had No 8520 on the back then automatic and a longer number beginning with F between the screws. Is 8520 the serial number? Is the F number the case number?
One picture I saw of a back looked like the writing on the back was black. On the watch I saw it was the same color as the rest of the back.
The watch was heavy and looked good. It came with a Audemars Piguet box. The one thing that I wondered about was the stem. When I unwound it there were three positions to the stem, winding, date setting and a hacking time setting position. When it was in the first position it didn't really seem like it was winding anything. There really wasn't any resistance. Also when I tightened the crown down, it only screwed down a turn or two.
Of course I don't have any pictures of the watch I saw but it did look a lot like this one. However, I am aware that fakes are good. If you have any tips or advice to checking out a Royal Oak, I'd appreciate it.