The Seiko 3421-0090 is a watch model based on the 3421 movement.
Parts List
| 200N08GN00 | crystal |
| 30M06NA1 | crown - crown |
| 30M06NS1 | crown - crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0H1860N01 | case back gasket - case back gasket |
| HL06A | band - band |
| HL07A | band - band |
| HL05A | band - band |
| 08SC14NG | others - second hand |
| 08T02DGH | others - hour hand |
| 08T02DGM | others - minute hand |
| 08T02DSH | others - hour hand |
| 08T02DSM | others - minute hand |
| 0354546 | others - winding stem |
| 83118650 | others - case ring |
| 3421009025 | others - case |
| 342103600153 | others - dial |
| 3421036012E4 | others - dial |
| 34210370FY42 | others - dial |
| 34211 | others - machine code |
| B090BS | others - push pin |
| 342100902E | others - case |
| 08SC14NS | others - second hand |
Caliber 3421
