The Seiko 7731-5081 is a watch model based on the 7731 movement.
Parts List
| RE8N29SN00 | crystal - crystal (sapphire) |
| 30M23NG5 | crown - crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0F235BAA3 | case back gasket |
| 0F230BAA3 | case back gasket - case back gasket |
| JA10A | band - band |
| 10P57CGH | others - hour hand |
| 10P57CGM | others - minute hand |
| 77315080XB14 | others - dial |
| 77315080XY14 | others - dial |
| 77315081 | others - case back |
| 7731508100A | others - case |
| 773162 | others - machine code |
| 82723030 | others - case ring |
| A190BS | others - push pin |
| 0354371 | others - winding stem |
| 10SC39VG | others - second hand |