The Seiko 4N21-0210 is a watch model based on the 4N21 movement.
Parts List
| 170A02SN02 | crystal - crystal (sapphire) |
| 30MJ7NA1 | crown - crown |
| 0F150BAA5 | case back gasket - case back gasket |
| 0H1600B01 | case back gasket - case back gasket |
| DK42D | band - band |
| 3BA075F1BNG | others - second hand |
| 07SC43NG | others - second hand |
| 07T73JGH | others - hour hand |
| 07T73JGM | others - minute hand |
| A110BS | others - push pin (for mb) |
| 4N210570XG14 | others - dial |
| 4N2164 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |
| 4N21021075 | others - case |
| 82351251 | others - bezel |
| 4N210210 | others - case back |
| 82841070 | others - case ring |
| 0351156 | others - winding stem |