The Seiko 5421-5020 is a watch model based on the 5421 movement.
Parts List
| ES6N48AN00 | crystal |
| 35N18NA1 | crown |
| 35N18NS1 | crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A1600N01 | case back gasket |
| ES6N48AN00 | crystal |
| 35N18NA1 | crown |
| 35N18NS1 | crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A1600N01 | case back gasket |
Caliber 5421
