Audemars Piguet Royal Oak Two Tone Day Date Moon Phases Ref. 25594SA

$13,500.00 USD

DETAILS
Manufacturer: Audemars Piguet
Model: Royal Oak Day Date Moon Phases
Reference Number: 25594SA.OO.0789SA.01     
Movement: Automatic
Condition: Good (wear consistent with use and age, some surface scratches that can be easily removed using laser polishing)
Gender: Men’s/unisex
Time Period: 1980's
Retail / Compare-At Price: n/a collector's item
Our Best Price: $13,500

CALIBER
Movement: -
Caliber: 2124/2825
Jewels: 33

CASE
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: Silver with waffle “Grande Tapisserie” decoration
Dial Numerals: 18K yellow gold applied with luminescent coating faceted baton hour indices

BRACELET / STRAP
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

FUNCTIONS
Hours, minutes, subsidiary day of the week dial at 9 o'clock, subsidiary date of the month dial at 3 o'clock, moon phases indicator at 6 o'clock, at 45-hour power reserve

OTHERS
Octagonal shape case designed by Gerald Genta
18K yellow gold applied and luminescent coating Royal Oak hours/minutes 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. 25594SA has a mechanical automatic Audemars Piguet caliber 2124 movement that's rhodium-plated, with fausses cotes embellishment. The rotor is mounted on a ball bearing, with peripheral mass in 22K gold. It has a round shape, 26mm diameter, thickness 4.55mm. It is constructed with a smooth balance in Glucydur, 33 rubies (escapement wheel with end stone), a flat balance-spring in Nivarox 1 with adjustment device with 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. 25594SA powered by the self-winding caliber 2124/2825 was introduced around 1984. The 2825 moon phase and day date modification is put on the base 2124 auto with date window movement, itself a JLC base caliber fine finished and adjusted at AP.
The screw-down crown controls ALL functions - day, date, moonphase, 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 = setting the moonphase. Turning the crown upward (toward 12) advances the moonphase, without affecting any other settings or functions.
P2 = in this position, the crown controls the hour and minute hands directly. At 12am indicated, the date advances, and at 1:30am, 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)