I'm not sure of the exact age, but... it's a hand-wound mechanical watch, so it's likely old. I've been told it's a "collector's item" and "for enthusiasts," removed from the actual machine. 【Search Keywords】 #Bell & Ross #Aircraft Instruments #Pilot Watch #Indicator Clock #For Aircraft ●Made by AEROSONIC… (excerpt from the website below) Founded in 1953, Aerosonic is a leader in the field of aviation instrumentation and avionics (aviation data systems, standby displays, digital and mechanical standby instruments, sensors, probes, etc.). Our customers include major manufacturers of today's civilian, military, and business fixed-wing and rotorcraft platforms, as well as all branches of the U.S. military. ●It works. Winding the mainspring by turning the knob between 7 and 8 o'clock starts it. ※Daily accuracy is 30-60 seconds (measured indoors at room temperature on a desk). ※It's old, so the error may vary depending on the environment. ※Although there is an "8 DAYS" marking, it probably won't run for 8 days even when fully wound, so please purchase it with the assumption that adjustment and maintenance will be required (in my check, it runs for 5-6 days). ※Please purchase only if you understand mechanical watches (hand-wound) (unlike quartz battery watches). ●Size… Approximately 6cm x 6cm I don't know the detailed specifications, the crystal appears to be glass. ●Due to reasons such as the product being different from what you expected, and to prevent swapping, please purchase only if you agree to abide by the No Claim/No Return policy. ※I repeat, it's old. Please confirm the description carefully and make your purchase after carefully reviewing the photos.