The Seiko 7770-6020 is a watch model based on the 7770 movement.
Parts List
| 260N39SR01 | crystal |
| 25N01DE5 | crown |
| 25N01DE5C | crown |
| 0D230NAA1 | case back gasket - case back gasket |
| LK04P | band - leather band |
| LK05P | band - leather band |
| A160AS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 81505076 | others - case back screw |
| 09P99JGM | others - minute hand |
| 09S51JGH | others - hour hand |