**SPECIFICATIONS** **Brand:** Cartier **Model:** Santos-Dumont Ultra Thin **Reference:** 96054 **Year:** 1980s **Case Number:** 960540435 **Case Material:** Yellow gold **Diameter:** 27 mm **Lug Width:** 17 mm **Thickness:** 4.2 mm **Lug-to-Lug:** 36.0 mm **Dial:** White **Lume:** None **Crystal:** Mineral glass **Movement:** Hand-wound **Caliber:** Frédéric Piguet 21 **Bracelet/Strap:** Molequin midnight black saffiano strap with gold-plated tang buckle **CONDITION & PERFORMANCE** **Case:** The yellow gold case shows normal wear in the form of a few hairlines, light scratches, and tiny scuffs throughout. The lugs are thick and well defined with the chamfers still intact. The bezel remains flat and crisp at the edges. The caseback has hairlines and light scuffs present. The brand, serial, and hallmark engravings are sharp and legible. **Dial, Hands, & Crystal:** The white lacquer dial shows light discoloration at the edges and a couple faint cracks and micro bubbles visible only under a loupe. The blued sword hands are free of any notable imperfections. The mineral glass crystal has some micro chipping at the edge near 2 o'clock, but otherwise remains clean and scratch-free. **Bracelet/Strap:** Both Molequin calfskin straps show hardly any wear with plenty of life left to give. **Timing & Functions:** The watch has been measured with a timegrapher at six different positions. After servicing and regulating, the rate and beat error are slightly above our benchmarks in a few positions, which is not uncommon for this ultra thin movement. While resting face up, the rate is +26s/d. **Service History:** The watch underwent a full service by WatchCheck that was completed on 09/30/2025. **WHAT'S INCLUDED** \- Cartier Santos-Dumont Ultra Thin on a midnight black saffiano strap. \- Service record from WatchCheck dated September 2025 and a Molequin taupe grained calfskin strap. Timestamp: [https://imgur.com/a/OzGcVBS](https://imgur.com/a/OzGcVBS) **PRICE & DELIVERY** I'm asking **$12,500** net to me via wire transfer, Zelle, or PayPal + fees. The price includes expedited shipping via FedEx within the U.S. and internationally. No trades. Feel free to reach out with any questions!