| Hattori Calibre Number | 2104A, 2104B, 2107A, 2118A, 2119A, 2119B |
| Japanese Part Description | 002, 422, Auto Mainspring, Mainspring |
| Mainspring Barrel Diameter | 7 |
| Mainspring Height | 1.35 |
| Mainspring Length | 300 |
| Mainspring Thickness (Strength) | .07, 0.07 |
| Mainspring Type | Non Auto |