Audemars Piguet Royal Oak Day-Date Moon Phase Two Tone Ref. 25594SA
Manufacturer: Audemars Piguet
Model: Royal Oak Day-Date Moon Phase
Reference Number: 25594SA.OO.0789SA.01
Time Period: 1980s
Retail / Compare-At Price: n/a discontinued, collector's item
Our Best Price: $27,500
Case Material: Stainless steel
Case Diameter: 36.5 mm
Thickness: 9 mm
Waterproof: 100 ft. / 30 m.
Water Resistance: 3 ATM
Material Bezel: Fixed 18K yellow gold secured with 8 white gold screws
Glass: Sapphire crystal
Dial: Cream with waffle “Grande Tapisserie” decoration
Dial Numerals: 18K yellow gold applied with luminescent coating faceted baton hour indices
Bracelet color: 18K yellow gold and stainless steel
Bracelet Material: 18K yellow gold and stainless steel
Clasp: Fold-over Audemars Piguet
Clasp material: Stainless steel
Hours, minutes, subsidiary day of the week dial at 9 o'clock, subsidiary date of the month dial at 3 o'clock, moon phase indicator at 6 o'clock, 45-hour power reserve
Octagonal shape case designed by Gerald Genta
18K yellow gold applied and luminescent coating Royal Oak hour/minute hands, yellow gold stick-shaped sub-dial hands
Stainless steel solid case back secured with eight white gold screws
Stainless steel screw-down hexagonal crown
The three-body case, lugs, and flat bezel are polished/brushed.
Integral 18K yellow gold and stainless steel link bracelet with a stainless steel deployant buckle and downturned integral stainless steel lugs.
This Audemars Piguet Royal Oak ref. 25594 SA has a mechanical automatic Audemars Piguet caliber 2124 movement rhodium-plated, with fausses cotes embellishment. The rotor is mounted on a ball bearing, with a peripheral mass in 22K gold. It has a round shape, 26mm diameter, thickness of 4.55 mm. It is constructed with a smooth balance in Glucydur, 33 rubies (escapement wheel with end stone), a flat balance-spring in Nivarox 1 with an adjustment device with a micrometric screw, Kif anti-shock. The plate is perlage decorated, the bridge and rotor are Vagues de Genève decorated, and Anglage finished, the screw heads are mirror-polished.
This ref. 25594 SA powered by the self-winding caliber 2124/2825 was introduced around 1984. The 2825 moon phase and day date modifiers are put on the base 2124 auto with date window movement, a JLC base caliber fine finished and adjusted at AP.
The screw-down crown controls ALL functions - day, date, moon phase, and of course, the hour and minutes.
Defining the crown positions as follows:
P0 = crown in, all the way
P1 = crown out first detente position
P2 = crown out second detente position, or all the way out
P0 is a neutral position and (I believe) allows the automatic movement to be wound manually.
P1 = moon phase setting; turning the crown upward (toward 12) advances the moon phase without affecting other settings or functions.
P2 = in this position, the crown controls the hour and minute hands directly. Thus, at 12 am indicated, the date advances, and at 1:30 am, the day of the week advances. Thus, as one sets the time through its 24-hour cycle, the date advances every midnight, and the day of the week advances about an hour later.
This mechanism oscillates at the frequency of 21,600 vph (3 Hz).
Case, dial, and movement are all signed.
Incomplete (box, no papers)
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