**OVERVIEW** The story of the Reverso began in the late 1920s when British officers stationed in India requested a watch that could withstand the rigors of playing polo. In response, the watchmakers at Jaeger-LeCoultre ingeniously created a hinged slide mechanism that flipped the case over to safely protect the watch face during play. While it was built to withstand the rough and tumble of the game, the design of the Reverso remained elegant and simple with decorative lines, streamlined contours, and a minimalist aesthetic. In the early 2010s, nearly 80 years after its creation, Jaeger-LeCoultre began paying homage to the design of the 1931 Reverso through a series of Tribute models that bore the same sword hands, dart indices, and simple “Reverso” branding as the original. While the initial Tribute models opted for the monoface casing, the brand eventually released this Grande Reverso Ultra Thin 1931 Duoface containing a white opaline dial for tracking the time at home, and a Clous de Paris black dial on the reverse side for tracking the local time while away. In addition to giving the wearer a choice between the two different dials, the 1931 Duoface lives up to its Ultra Thin moniker with a discreet 9.3mm case that allows it to seamlessly slide under any jetsetter’s sleeve. ​ **SPECIFICATIONS** **Brand:** Jaeger-LeCoultre **Model:** Grande Reverso Ultra Thin 1931 Duoface **Reference:** Q3788570 **Year:** 2013 **Case Number:** 2930345 **Material:** Stainless steel **Diameter:** 27.4mm **Thickness:** 9.3mm **Lug Width:** 20mm **Lug-to-Lug:** 46.8mm **Dial:** White/black **Lume:** Super-LumiNova **Crystal:** Sapphire **Movement:** Hand-wound **Caliber:** JLC 854/1 **Bracelet/Strap:** JLC navy alligator strap with tang buckle *Hand model has a wrist size of 6.2in* ​ **CONDITION** *EXCELLENT: Case has very light scratches or nicks. Lugs are thick, full, and well-defined. Dial and hands may have imperfections visible upon close inspection. Lume is fully intact and may show slight discoloration.* **Case:** The case is very well preserved with only a few hairlines, tiny scuffs, and micro nicks present, the most notable of which is on the lug casing at 11 o’clock. The lugs are nice and strong with even contouring. The reversing chassis is clean with no imperfections to note. The brushed finish of the case back shows no scratching and the engravings remain sharp and deep. **Dial, Hands, & Crystal:** Both dials and their respective handsets are in perfect condition. The Super-LumiNova within the hands on the reverse side is fully functioning and consistent. Both sapphires are squeaky clean and scratch-free. **Bracelet/Strap:** The JLC navy alligator strap shows minor signs of wear including slight creasing on the backside near the first hole. Other than that, there is no major staining or fraying. ​ **MOVEMENT** **Timing:** The watch has been measured with a timegrapher at six different positions. The average rate, amplitude, and beat error are within acceptable ranges. While resting face up, the rate is +3s/d. **Functions:** All functions including the crown-winding, time-setting, and jumping hour button are working as expected. **Service History:** None. ​ Pictures: [https://imgur.com/a/Fl2lM4R](https://imgur.com/a/Fl2lM4R) Timestamp: [https://imgur.com/a/z6YxOft](https://imgur.com/a/z6YxOft) ​ **PRICE & DELIVERY** I'm asking **$8,000** net to me via bank transfer or PayPal + fees. The price includes expedited shipping via FedEx within the U.S. and internationally. Trades will not be accepted. Feel free to reach out if you have any questions and I'd be happy to answer them for you. I've sold numerous watches on the forums and can provide references at your request. I'm also available on Instagram as [tickingtimehomme](https://www.instagram.com/tickingtimehomme/). Thanks for looking!