The Seiko 4J81-0A31 is a watch model based on the 4J81 movement.
Parts List
| 0F180BAD2 | case back gasket - case back gasket |
| A012CZ | band - band |
| HB18B | band - band |
| HB19B | band - band |
| 81190055 | others - bracelet fixing pipe |
| 81611169 | others - bracelet fixing pin |
| EA0040B0A | others - crown and stem gasket |