The Seiko B122-4020 is a watch model based on the B122 movement.
Parts List
| SA3N52GM01 | crystal |
| SA3N52GM02 | crystal |
| 35M64NS1 | crown - crown |
| 35M64NA1 | crown - crown |
| 0G2140B01 | case back gasket |
| 0A0064B01 | case back gasket |
| 80612041 | pusher |
| SA3N52GM01 | crystal |
| SA3N52GM02 | crystal |
| 35M64NS1 | crown - crown |
| 35M64NA1 | crown - crown |
| 0G2140B01 | case back gasket |
| 0A0064B01 | case back gasket |
| 80612041 | pusher |
Other models with the same movement
| B122-4000 |
| B122-4010 |
| B122-4030 |
| B122-4050 |
| B122-5000 |