Manufacturer Grand Seiko (Seiko Watch Corporation) Caliber Number 9R31, 9R31A Movement Type Spring Drive, manual-wind In-House? Yes Jewels 30 Frequency...
Dual-Spring Barrel
Most Liked
Part of the 
network of watch sites
network of watch sites network of watch sites
1970’S Nivada watch with AS.1916 movement
Hi: Recently, I bought a Nivada watch with an AS.1916...
cjf90 , 4 days ago
It's a lovely design! The case engraving is the case nu...
Crobieson , 6 days ago
Recent Comments
Found into a Certina DS 115 (7040/7140) 45
In my opinion, eta 2892- 2894 it s better in term of keeping time than…
Used by the Orion Hellcat
There is no regulator on the escapement, regulation is achieved using a laser adjustment system…
Thank you.
The 01 number varies according to the position of the complication. For example ST3600 is…
Hi Thomas, the same manual also states: "Automatic selection of time signal stations (JJY only)"…