The Seiko 5646-7021 is a watch model based on the 5646 movement.
Parts List
| 300V66GCSF | crystal |
| 45M32NS9 | crown |
| 0B1935B01 | case back gasket |
| FH2980B01 | case back gasket - case back gasket |
Other models with the same movement
| 5646-5010 |
| 5646-7000 |
| 5646-7005 |
| 5646-7010 |
| 5646-7011 |
| 5646-7020 |
| 5646-7030 |
| 5646-7040 |
| 5646-8000 |