The Seiko 7770-5280 is a watch model based on the 7770 movement.
Parts List
| K06N21SN01 | crystal |
| 25N49DX5 | crown - crown |
| 25N49DE5 | crown - crown |
| 25N49DE5C | crown |
| 25N49DX5C | crown |
| 0D260NA11 | case back gasket |
| GI139 | others - other band |
| GI140 | others - other band |
| DZ0040B01 | others - crown and stem gasket |
| 81505095 | others - case back screw |
| 81505097 | others - case back screw |
| 09S03DGM | others - minute hand |
| 09S03DGH | others - hour hand |
| 09S03DSH | others - hour hand |