The Seiko 7770-5270 is a watch model based on the 7770 movement.
Parts List
| ESWN81SN00 | crystal |
| 25N03DX5 | crown - crown |
| 25N03DX5C | crown |
| 0C280NA11 | case back gasket |
| VI060 | others - other band |
| DZ0040B01 | others - crown and stem gasket |
| 09S31CSH | others - hour hand |