The Seiko 3421-531A is a watch model based on the 3421 movement.
Parts List
| ES4N46GM01 | crystal - crystal |
| 35M94NS1 | crown |
| 0A2050N01 | case back gasket - case back gasket |
| 0G0055B01 | case back gasket - crown and stem gasket |
| ZZ02A | band - band |
| 08SC14NG | others - second hand |
| A110BS | others - push pin (for mb) |
| 34210720XN14 | others - dial |
| 34211 | others - machine code |
| 0354546 | others - winding stem |
| 82701780 | others - case ring |
| 3421531A11 | others - case |
| 07T04NGM | others - minute hand |
| 07T04NGH | others - hour hand |
| ES4N46GM01 | crystal - crystal |
| 35M94NS1 | crown |
| 0A2050N01 | case back gasket - case back gasket |
| 0G0055B01 | case back gasket - crown and stem gasket |
| ZZ02A | band - band |
| 08SC14NG | others - second hand |
| A110BS | others - push pin (for mb) |
| 34210720XN14 | others - dial |
| 34211 | others - machine code |
| 0354546 | others - winding stem |
| 82701780 | others - case ring |
| 3421531A11 | others - case |
| 07T04NGM | others - minute hand |
| 07T04NGH | others - hour hand |
Caliber 3421
