The Seiko 5421-5030 is a watch model based on the 5421 movement.
Parts List
| SA5N86AN00 | crystal |
| SA5N86AN001 | crystal |
| 35M94NA1 | crown |
| 35M94NS1 | crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A1700N0 | case back gasket |
Caliber 5421
Seiko 5421-5030 Watch Guide