The Seiko 7770-5050 is a watch model based on the 7770 movement.
Parts List
| SA3W45SN00 | crystal |
| 25M13DE5 | crown |
| 25M13DX5 | crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0F245BAA5 | case back gasket - case back gasket |
| 0F245NAA1 | case back gasket |
| GI096 | others - other band |
| GI097 | others - other band |