18ct yellow gold tonneau case with integrated inclined bezel with convex sapphire glass, having lugged rectangular screwed back signed Franck Muller Geneve Master of Complications No. 4. With serrated crown and four flush pushers for calendar setting, with tapered gold pushers for the chronograph stop/start and zero functions. Reference 7850 CC QPB.
Engine turned convex silver dial with black tumbling Arabic numerals, blued steel hands, inner chapter ring with bi-retrograde perpetual calendar inscribed for days of the week, Mo to Su and days of the month 1-31, each with blued steel hands. Having recessed month dial below 12 for alternative months. With further recessed dials and blued steel hands for the chronograph counters of 30 minute and 12 hour respectively with blued steel centre sweep chronograph seconds hand. Having recessed moon dial above 6 with rotating blue disc mounted with gold moon and stars, with aperture below 12 showing the leap year.
Swiss-made automatic nickel lever movement with 45 jewels, signed Frank Muller calibre 5888BR. Monometallic balance with self-compensating flat balance spring, platen 950 rotor, adjusted to 5 positions.
48 x 35mm.
Case and movement in excellent condition, with some minor surface scratched. Original Franck Muller box and papers, dated 2002.
An oversized 18ct yellow gold tonneau cased automatic bi-retrograde perpetual calendar chronograph wristwatch with moon-phases and leap year indication. Number 4.