An exceptional and rare execution of the iconic Franck Muller tonneau silhouette. This reference 7502 S6 features a striking silver guilloché dial with exploding Breguet numerals, leaf hands, and a sub-seconds register at 6 o'clock. Unlike standard solid-back models, this rare variant features a factory sapphire exhibition caseback displaying a breathtaking, fully hand-engraved/engled manual-wind movement. Mounted on its original, high-polish Franck Muller stainless steel multi-link bracelet with a hidden butterfly clasp. The certificate of origin dates the initial purchase to September 28, 2005.

Condition: Bezel/Case: Very good pre-owned condition. I would give it 8.7/10 condition. Crystal: Pristine, curved sapphire crystal. The surface is entirely free of chips, scratches, or blemishes. Bracelet: Factory steel bracelet is in excellent shape with minimal stretch, showing only light desk-diving marks on the high-polish elements.

Authenticity & Movement Health: Movement is the hand-finished Franck Muller Calibre 7500 manual-wind base. Verified for authenticity and performance: Matching Serials: Fully intact and verified. The reference number (7502 S6 LTD O AC) and case numbers on the paperwork match the engraving on the caseback flawlessly. Beat Rate: Timegrapher confirms a rock-solid amplitude and accurate beat frequency of 21,600 VPH (3Hz). Performance: Excellent trace health. The timegrapher reads at a tight -2s/d flat line with a strong amplitude of 259 and a minimal beat error of 0.4ms Health: The clean parallel trace lines confirm zero magnetization issues and superb gear train stability, requiring no immediate service.

Specs: Size: 29mm x 39mm. 36mm lug-to-lug, wears beautifully as a mid-size dress piece) Movement: Hand-engraved Calibre 7500 Manual Winding Depth: 3 ATM (Water Resistant) Power Reserve: ~42 Hours Includes: Original inner lacquered wood presentation box (with insert), outer leather-grain box, and original leather wallet containing the stamped and dated Certificat d'Origine et de Garantie (September 2005).