Classic (non-Royal Oak) 25717

Round manual-wind 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.. The documented 25717PT platinum edition commemorates the Swiss Confederation’s 700th anniversary in 1991, with a 33 mm stepped case, teardrop lugs, white baton-marker dial and commemorative caseback.