Manufacturer | ETA/Unitas |
Caliber Number | 6503 |
Base Caliber | ETA/Unitas 6497 |
Movement Type | Manual wind |
Size (lignes) | 16.5”’ |
Diameter | 36.6mm |
Height | 5.0mm thick |
Jewels | 15 or 17 |
Vibrations Per Hour | 18,800 bph |
Shock System | Incabloc |
Winding Direction | Uni-directional |
Hacking? | No |
Functions | Hours, minutes, small seconds at 9:00, date |
Country of Manufacture | Switzerland |
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:
Recent Comments
Militado got this movement
Henry Archer Vesterhav. Mine is running at +2 sec/day. I do wish that the movement…
Step 1) Set the time correctly. Step 2) Wait 24 hours. Step 3) Compare the…
The wonderfully underrated Festina Automatic Skeleton (20632/1) also uses this movement. It keeps time better…
17 is the grout number. ST1701 is the specific automatic calibre and ST1700 the manual…
Duzu Watches of Western Australia use this movement in their DW-D3 diver range