The Seiko 7770-5220 is a watch model based on the 7770 movement.
Parts List
| ESHN81S30A | crystal |
| ESHN81SM02 | crystal |
| 25N49DX5 | crown - crown |
| 25N49DE5 | crown - crown |
| 25N49DE5C | crown |
| 25N49DX5C | crown |
| 0H2300N01 | case back gasket |
| GI113 | others - other band |
| GI154 | others - other band |
| DZ0040B01 | others - crown and stem gasket |
| 12S07CSH | others - hour hand |
| 12S07CSM | others - minute hand |
| 12S07CAH | others - hour hand |