The Seiko 7770-503B is a watch model based on the 7770 movement.
Parts List
| ESHN81SN00 | crystal |
| 25N01DX5 | crown |
| 0H2300N01 | case back gasket |
| GI095 | others - other band |
| DZ0040B01 | others - crown and stem gasket |
| 11S053SH | others - hour hand |
The Seiko 7770-503B is a watch model based on the 7770 movement.
| ESHN81SN00 | crystal |
| 25N01DX5 | crown |
| 0H2300N01 | case back gasket |
| GI095 | others - other band |
| DZ0040B01 | others - crown and stem gasket |
| 11S053SH | others - hour hand |