The Seiko 5421-5100 is a watch model based on the 5421 movement.
Parts List
| SA4W04GM01 | crystal |
| 35MASNA1 | crown |
| 0A1800N01 | case back gasket |
Caliber 5421
Seiko 5421-5100 Watch Guide
The Seiko 5421-5100 is a watch model based on the 5421 movement.
| SA4W04GM01 | crystal |
| 35MASNA1 | crown |
| 0A1800N01 | case back gasket |