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Eta Unitas 6503

ETA/Unitas Caliber 6503

Eta Unitas 6503

ManufacturerETA/Unitas
Caliber Number6503
Base Caliber
ETA/Unitas 6497
Movement TypeManual wind
Size (lignes)
16.5”’
Diameter
36.6mm
Height
5.0mm thick
Jewels15 or 17
Vibrations Per Hour
18,800 bph
Shock SystemIncabloc
Winding DirectionUni-directional
Hacking?
No
FunctionsHours, minutes, small seconds at 9:00, date
Country of ManufactureSwitzerland
Known Brands
Add your watch in the comments below…

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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