The Seiko 3421-5140 is a watch model based on the 3421 movement.
Parts List
| ES1N98GN00 | crystal - crystal |
| 30M06NA1 | crown - crown |
| 30M06NS1 | crown - crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A1900N01 | case back gasket - case back gasket |
| ZL06A | band - band |
| ZL05A | band - band |
| ZL07A | band - band |
| 08SC14NG | others - second hand |
| 08T04NGH | others - hour hand |
| 08T04NSH | others - hour hand |
| 07T08NGM | others - minute hand |
| 07T08NSM | others - minute hand |
| A100BS | others - push pin (for mb) |
| 342103301143 | others - dial |
| 3421033012E4 | others - dial |
| 342103400S49 | others - dial |
| 34211 | others - machine code |
| 0354546 | others - winding stem |
| 342151402E | others - case |
| 3421514025 | others - case |
| 83118070 | others - case ring |
| 08SC14NS | others - second hand |
| 07T06AGH | others - hour hand |
| 07T16AGM | others - minute hand |
Caliber 3421
