The Seiko 4N21-039A is a watch model based on the 4N21 movement.
Parts List
| 175A02SN02 | crystal - crystal |
| 30M81NA4 | crown - crown |
| 0F150BAA5 | case back gasket - case back gasket |
| 0H1600B01 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| MK29F | band - band |
| 07SC29DG | others - second hand |
| 07TG6DGH | others - hour hand |
| 07TG6DGM | others - minute hand |
| 82841030 | others - case ring |
| 82352771 | others - bezel |
| 4N21039A75A | others - case |
| 4N21039A | others - case back |
| 4N21039A75B | others - case |
| 4N210780XG14 | others - dial |
| 4N2164 | others - machine code |
| A110AS | others - push pin |