The reference 25863ST.OO.A001CU.01 is a prototype of the Royal Oak Offshore T3. Unlike the final production model, this version features screws that are raised slightly above the bezel.One of a select number that made it into production was auctioned during the December 2, 2003 Time to Give Afghanistan auction in Beverly Hills. Of this specific watch the caseback was engraved with the signature of Arnold Schwarzenegger.
