The Seiko 4J81-0B30 is a watch model based on the 4J81 movement.
Parts List
| 240P20SB0A | crystal - crystal (sapphire) |
| 6K45A8STWA | crown - crown |
| 0F230BAD2 | case back gasket - case back gasket |
| 86582680 | crystal gasket - plastic gasket for crystal |
| A088AB | band - band |
| 10ST183D | others - second hand |
| 10ST183S | others - second hand |
| 1BX072S0BXL | others - hour hand |
| 2BX102S0BXL | others - minute hand |
| 0351405 | others - winding stem |
| AC004BAD1 | others - crown and stem gasket |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 4J810B3003 | others - case |
| 82842640 | others - case ring |
| 4J810B30 | others - case back |