The Seiko Y771-4009 is a watch model based on the Y771 movement.
Parts List
| BA1W74GM01 | crystal - crystal (inorganic) |
| 86173340 | case back gasket - plastic gasket for crystal |
| EG0115B01 | case back gasket - button gasket |
| 86563740 | crystal gasket - plastic gasket for crystal |
| 80600429 | pusher - button |
| 7BS9ZY | band - leather band |
| 86510029 | others - conducting plate |
| A180BS | others - push pin |
| Y771400961 | others - case |
| 83200101 | others - button spring clip |
Other models with the same movement
| Y771-5030 |
| Y771-503A |
| Y771-503B |
| Y771-5049 |