The Seiko 3421-5020 is a watch model based on the 3421 movement.
Parts List
| SA3N08GN00 | crystal |
| 30M06NA1 | crown - crown |
| 30M06NS1 | crown - crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A1800N01 | case back gasket |
| KS200 | band - band |
| KS20S | band - band |
| 06T02DGH | others - hour hand |
| 06T02DGM | others - minute hand |
| 06T02DSH | others - hour hand |
| 06T02DSM | others - minute hand |
| 08SC14NG | others - second hand |
| 0354546 | others - winding stem |
| 3421502025 | others - case |
| 83118850 | others - case ring |
| 342150202E | others - case |
| 342100601894 | others - dial |
| 342100603274 | others - dial |
| 342100608SC3 | others - dial |
| 34211 | others - machine code |
| B090AS | others - push pin |
| 08SC14NS | others - second hand |
Caliber 3421
