The Grand Seiko caliber 3180, later renamed 5720, is a manual winding mechanical movement, introduced in 1960 with the Grand Seiko First model. It combined some characteristics of the movements previously developed by Seiko for the Lord Marvel and the Crown. The accuracy was +12/-3 seconds per day.
| Caliber | 3180 (later renamed 5720) |
| Type | Mechanical Manual |
| Family | 57GS |
| Year | 1960 |
| Jewels | 25 |
| Bph | 18,000 |
| Accuracy | +12/-3 seconds per day |
| Complications | – |
| Technical information | Japanese – English |
Grand Seiko watches with caliber 3180
Ref. J14070 – Gold Filled
Movement: 3180
Type: manual
Jewels: 25
Bph: 18.000
Case: gold filled (14k gold, 80 micron)
Dial variations: SD, AD
Logo variations: engraved, printed, raised
Ref. J14070 – Platinum
Movement: 3180
Type: manual
Jewels: 25
Bph: 18.000
Case: platinum
Dial variations: SD, AD
Logo variations: engraved, printed, raised