The Seiko 7770-5040 is a watch model based on the 7770 movement.
Parts List
| 25N01DE5 | crown |
| 0H2500B01 | case back gasket - case back gasket |
| 0H2500N01 | case back gasket |
| YK18ZA | band - leather band |
| A180AS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |