Gruen Precision

Gruen, Precision Airflight "Jumping Hours"

The watch was observed to be running at the time of cataloguing. It has not been tested for timekeeping accuracy and may require adjustment. Jumping hours are functioning properly. Light oxidation and scratches to the case. Gruen, Precision Airflight "Jumping Hours" Swiss. Gold plated. An innovative Gruen Precision Airflight wristwatch, featuring the distinctive jumping-hour mechanism that reveals 1-12 numerals by day and 13-24 numerals by night. This clever design catered to pilots and travellers, allowing for quick reading of the 24-hour time. A desirable example of mid-century horological ingenuity.