The Seiko Y723-4000 is a watch model based on the Y723 movement.
Parts List
| SA1W30GM01 | crystal |
| SA1W30GM02 | crystal |
| SA1W30GM04 | crystal |
| SA1W30GM05 | crystal |
| FH2881B01 | case back gasket - case back gasket |
| 0A0110B01 | others |
Other models with the same movement
| Y723-4010 |
| Y723-4059 |
| Y723-4080 |
| Y723-5000 |
| Y723-5049 |
| Y723-5059 |