The Seiko 8N70-5031 is a watch model based on the 8N70 movement.
Parts List
| ESHN81S30B | crystal |
| 25M65DXA | crown - crown |
| 0H2600N01 | case back gasket - case back gasket |
| GI157 | others - other band |
| DZ0040B01 | others - crown and stem gasket |
| 11S05DSH | others - hour hand |
| 11S05DSM | others - minute hand |