Onsa Swiss-made Mens Watch Antique 1960s Vintage Mechanical Wristwatch

ONSA is a Swiss brand founded in Lengnau in 1923 by Hans Gilomen.
The watch has a width of 1.3 inches, a belt length of 8.66 inches, and a lug width of 0.63 inches.
This watch was made over 50 years ago, so you cannot expect the same accuracy as a modern quartz watch.
Please consider that antique mechanical watches invariably have a daily variation.
The daily variation will change depending on usage conditions.
It is difficult to trace the history of overhauls and repairs.
Parts may have been replaced with non-original parts.
Therefore, repairs at the manufacturer are difficult.
Please purchase at your own risk.
It is recommended to have it maintained at a watch store that handles antiques in your area.
Regular maintenance will allow you to use it for a long time; maintenance is recommended approximately every 3-4 years.