The Seiko 4J81-5A20 is a watch model based on the 4J81 movement.
Parts List
| SA0P16SB0A | crystal |
| SA0P16AB0B | crystal - crystal |
| SA0P16SB0B | crystal - crystal |
| 36M06NS2 | crown - crown (3h) |
| 0F180BAD2 | case back gasket - case back gasket |
| 86582840 | crystal gasket - plastic gasket for crystal |
| A076CM | band - band |
| A077AM | band - band |
| A078AM | band - band |
| 06ST06JG | others - second hand |
| 06ST06JS | others - second hand |
| 1BB045A4BHG | others - hour hand |
| 1BB045A4BHS | others - hour hand |
| 2BB062A0BHG | others - minute hand |
| 2BB062A0BHS | others - minute hand |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82837480 | others - case ring |
| 4J815A2001 | others - case |
| 4J815A20 | others - case back |
| 4J815A2002 | others - case |
| 0351405 | others - winding stem |
| EA0040B0A | others - crown and stem gasket |