The Seiko 5931-5231 is a watch model based on the 5931 movement.
Parts List
| ES4N81SN00 | crystal - crystal |
| 35N85DJN | crown |
| 0H2300B01 | case back gasket |
| OH2300B01 | case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| AI006 | band - band |
Caliber 5931
Seiko 5931-5231 Watch Guide