Classic (non-Royal Oak) 25850

Round automaticAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist. perpetual calendarPerpetual calendarA calendar mechanism that accounts for different month lengths and leap years. with moon phasesMoon-phase displayAn astronomical indication showing the Moon’s changing appearance through its cycle, averaging about 29.5 days. Display accuracy and the interval between corrections depend on the mechanism; a maker’s specification for one calibre should not be applied to every moon-phase watch. and a textured bezelBezelThe frame surrounding the crystal at the front of a watch.. A documented 25850PT platinum example sold in 1994 has a silver dial with Breguet numerals, a leap-year indication and a display back; a separate gold example was auctioned circa 2000.