The Seiko 5931-5120 is a watch model based on the 5931 movement.
Parts List
| SA8N23SN00 | crystal |
| 35N85DJ5 | crown |
| OH2300B01 | case back gasket |
| DZ0065B01 | case back gasket - button gasket |
Caliber 5931
Seiko 5931-5120 Watch Guide
The Seiko 5931-5120 is a watch model based on the 5931 movement.
| SA8N23SN00 | crystal |
| 35N85DJ5 | crown |
| OH2300B01 | case back gasket |
| DZ0065B01 | case back gasket - button gasket |