Audemars Piguet
Brand Audemars Piguet, Le Brassus (Vallée de Joux)
Model “Quantieme perpetuel No 150”
Retailed by -
Year Circa 1980-1986
Reference BA 25555 / 000
Movement No. 263 865
Calibre 5020, 16 manual-winding, 20 jewels
Case No. C 44 371 (by Oréade, La Chaux-de-Fonds)
Material yellow gold (18-carat)
Bracelet -
Buckle -
Dimensions Ø 47.5 mm
Thickness 8.1 mm
Length -
Weight 79.3 gr (approx.)
Signature Dial, case and movement
Accessories - Audemars Piguet
Reference BA 25555 / 000, bissextile perpetual calendar, moon phases, white dial; (18-carat) yellow gold (18-carat) Yellow gold, open-face, pocket watch, keyless-winding, round-shaped, with six horological complications:
• Half-instantaneous bissextile perpetual calendar
• Date of the month (subsidiary dial at 3 o’clock)
• Day of the week (subsidiary dial at 9 o’clock; indications given in English)
• Month of the year (subsidiary dial at 12 o’clock; indications given in English)
• Four-year cycle of leap-years (subsidiary dial at 12 o’clock; indications given in English)
• Age and phases of the moon (subsidiary dial and aperture at 6 o’clock) Case: three-piece, “carrure ronde”, polished and satin-finished, satin-finished band; dome-shaped screwed bow, cabochon sapphire-set crown. Dial: white colour, lacquered, with black painted radiating Roman numerals; external minute track divided five by five with black painted radiating lines; blued steel “Scoties” lozenge-shaped hands; blued steel calendar hands. Movement: calibre 5020, 16, manual-winding, 20 jewels, rhodium-plated with “fausses côtes” and “œil-de-perdrix” (circular graining) decoration, going barrel, straight-line lever escapement, Glucydur screw-balance, self-compensating Breguet hairspring, polished steel index-regulator, adjusted to heat, cold, isochronism and 5 positions; perpetual calendar mechanism with 48-month cam. Type of winding and time setting: winding and time-setting by the crown on the pendant.
