Reference 25594SA is a turning point in the history of Royal Oak. Audemars Piguet decided on 36mm as a mid-sized Jumbo equivalent in 1992, and this case width lasted for ten years. This watch has a beautiful, rich cream-toned dial with subdials for day, date, and moon phases. Overall, this timepiece is in excellent condition, with only a few minor surface blemishes on the case and bracelet that are consistent with light use.
Audemars Piguet - Royal Oak Day-Date Moon Phase Ref. 25594SA
Brand: Audemars Piguet
Model: Royal Oak Day-Date Moon Phase
Reference Number: 25594SA.OO.0789SA.01
Movement: Automatic
Gender: Mens
Condition: Excellent
Time Period: 1980s
Box: Yes
Papers: NoCaliber: 2124/2825
Jewels: 33Case Material: Stainless steel
Case Diameter: 36.5 mm
Thickness: 9 mm
Waterproof: 100 ft. / 30 m. / 3 ATM
Bezel Material: Fixed 18K yellow gold secured with eight white gold screws
Glass: Sapphire Crystal
Caseback: Solid
Dial: Cream with waffle "Grande Tapisserie" decoration
Dial Numerals: 18K yellow gold applied with luminescent coating faceted baton hour indicesBracelet Material: 18K yellow gold and stainless steel
Buckle: Fold-over Audemars Piguet
Buckle Material: Stainless steelHours, 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
The "SA" on the reference number denotes that this piece is composed of stainless steel and yellow gold, with an 18K yellow gold bezel secured by eight white gold screws. The integral, articulated, two-tone Royal Oak bracelet is completed with stainless steel folding Audemars Piguet clasp. The dial displays three complications; the sub-register at 9 o'clock registers the current day, the one at 3 o'clock shows the date, and the moon phase aperture is at six o'clock. It is easy to see why so many watch enthusiasts consider the Audemars Piguet Royal Oak the holy grail of timepieces as it exemplifies sporty-casual design and Swiss watchmaking of the highest caliber.
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, and 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.