The Seiko 3421-5220 is a watch model based on the 3421 movement.
Parts List
| SA1N94GN00 | crystal |
| 35M82NA1 | crown - crown |
| 35M82NS1 | crown - crown |
| 0A2800N01 | case back gasket - case back gasket |
| 0A2800N | case back gasket |
| XGA38A | band - leather band |
| 10T04AGH | hand - hour hand |
| 10T04AGM | hand - minute hand |
| 34210520XG18 | others - dial |
| 34211 | others - machine code |
| 3421522025 | others - case |
| A180CS | others - push pin |
| 0354546 | others - winding stem |
| 83118370 | others - case ring |
| 0884844 | others - holding ring for dial |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
Caliber 3421
