Audemars Piguet Perpetual Calendar

Brand Audemars Piguet, Le Brassus (Vallée de Joux) Model - Retailed by / made for - Year circa 1920-1925 Reference - Movement No. 33 569 Calibre 17’’’ ½, 19 jewels Case No. 33 569 Material/s white gold (18-carat) Bracelet - Buckle - Dimensions Ø 46.1 mm. Thickness 8.5 mm. Weight 60 gr. (approx.) Signature dial, case and movement Accessories - White gold (18-carat), open-face, keyless-winding, round-shaped, thin Art Deco pocket watch, with subsidiary seconds at 6 o’clock and 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) • Age and phases of the moon (subsidiary dial, graduated from 0 to 29 ½, and aperture at 6 o’clock) Case: three-piece, polished and satin-finished, “carrure effilée”; triangular-shaped screwed bow. Dial: silver colour, with applied suspended white gold Arabic numerals (1-2-4-5-7-8-10-11); “perlé” beaded external minute track with dots; white gold “Lozenge” hands. Movement: calibre 17’’’ ½, 19 jewels, rhodium-plated with “fausses côtes” decoration, going barrel, gold train of wheels, straight-line lever escapement, cut bimetallic compensated balance with gold poising screws, blued steel flat hairspring, polished steel index-regulator, eight adjustments.