The Seiko 3421-5090 is a watch model based on the 3421 movement.
Parts List
| SA3N80GN00 | crystal - crystal |
| 30M06NA1 | crown - crown |
| 30M06NS1 | crown - crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A1800N01 | case back gasket |
| HS16A | band - band |
| HS17A | band - band |
| 06T04DGM | others - minute hand |
| 06T04DSM | others - minute hand |
| 08SC14NG | others - second hand |
| 07T04DGH | others - hour hand |
| 07T04DSH | others - hour hand |
| 0354546 | others - winding stem |
| 83118850 | others - case ring |
| 3421509011 | others - case |
| 3421509025 | others - case |
| 342101900183 | others - dial |
| 3421019002C4 | others - dial |
| 3421019038L4 | others - dial |
| 34211 | others - machine code |
| A100AS | others - push pin |
| 08SC14NS | others - second hand |
Caliber 3421
