The Seiko 2661-5020 is a watch model based on the 2661 movement.
Parts List
| RE4N53KN00 | crystal |
| 35N89NA5 | crown |
| 0H1850B01 | case back gasket |
| DH0070B01 | case back gasket - crown and stem gasket |
Caliber 2661
Other models with the same movement
| 2661-5000 |
| 2661-5009 |
| 2661-5010 |
| 2661-5029 |
| 2661-5030 |
| 2661-5040 |
| 2661-5049 |
| 2661-5050 |
| 2661-5059 |