The Seiko 3421-5210 is a watch model based on the 3421 movement.
Parts List
| RE2N02GN00 | crystal |
| 30M30NA3 | crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A1900N0 | case back gasket |
Caliber 3421
Seiko 3421-5210 Watch Guide
The Seiko 3421-5210 is a watch model based on the 3421 movement.
| RE2N02GN00 | crystal |
| 30M30NA3 | crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A1900N0 | case back gasket |