Eta Unitas 6503

ETA/Unitas Caliber 6503

Eta Unitas 6503

Manufacturer ETA/Unitas
Caliber Number 6503
Base Caliber
ETA/Unitas 6497
Movement Type Manual wind
Size (lignes)
5.0mm thick
Jewels 15 or 17
Vibrations Per Hour
18,800 bph
Shock System Incabloc
Winding Direction Uni-directional
Functions Hours, minutes, small seconds at 9:00, date
Country of Manufacture Switzerland
Known Brands
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ETA/Unitas caliber 6503 is the rarely seen version of the manual wind ETA 6497 with a date complication.

The 6503 was produced in the 1960s and is currently discontinued. It is hard to find watches powered by this movement, if you have a timepiece with the 6503, please share it in the comments below.

Modern Usage:

There is a German watch company called Guinand which still produces a manual wind pocket watch featuring a calendar window at 3:00 (Model G-1996S). Guinand’s caliber HS81 is based on the ETA/Unitas 6503, but with modifications created by Helmut Sinn, including a central sweeping seconds hand (instead of the standard 6497 small seconds at 9:00), as well as a hacking mechanism. It is likely that they had access to new old stock 6503 movements for this model.

Additional Resources:

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