The Seiko 4J81-5020 is a watch model based on the 4J81 movement.
Parts List
| ES3A59S20A | crystal - crystal |
| 6M25Z7SNWA | crown |
| 0F180NA1S | case back gasket - case back gasket |
| AA38AB | band - band |
| 1BB040YABHG | others - hour hand |
| 2BB060YABHG | others - minute hand |
| 3DA060AABHG | others - second hand |
| 0351405 | others - winding stem |
| 4J81502061A | others - case |
| 82871390 | others - case ring |
| 4J815020 | others - case back |
| A120AS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |