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:
Trending Comments
Longines Caliber L836.6
The differenece is the beat rate. 3Hz vs 5Hz. 6 beats/s vs 10 beats/s.
Orient Caliber F6922
I've had my Mako and Ray Orient watches with these calibers, I guess. Their performance…
Invicta Caliber JSD-006ZY
Apart from the fact, that there is no further information about this caliber anywhere, it…
Seiko Instruments (SII) Caliber VH31
the VH-31 movement coupled with solar or kinetic in a Seiko watch would sell like…
Miyota/Citizen Caliber 9051
I have the 9051 in my Fujitsubo, it appears to be within 3 seconds. I'll…
Active Caliber Listings
It might be a Chinese Standart-movement aka Tong Ji aka 7120 / SS7 with an…
Thank you for sharing your experience with the community. If possible, please submit images of…
Apart from the fact, that there is no further information about this caliber anywhere, it…
This £80 lorus has the y676c with Japan on the rotor
Minute hand on some ETA's 2-hand quartz movements run every 20 secs so that the…