The Seiko Y749-4020 is a watch model based on the Y749 movement.
Parts List
| BA1W54GM01 | crystal |
| FH2781B01 | case back gasket |
| 86560260 | crystal gasket |
| 80612462 | pusher |
| GA72A | band - metal band |
| A190CS | others - push pin |
| EG0060B01 | others - button gasket |
| 83200101 | others - button spring clip |
Other models with the same movement
| Y749-4010 |
| Y749-401A |
| Y749-4030 |
| Y749-5010 |
| Y749-5030 |
| Y749-5040 |
| Y749-5050 |
| Y749-5060 |
| Y749-5070 |
| Y749-5080 |
| Y749-5090 |
| Y749-5100 |
| Y749-5130 |
| Y749-5140 |
| Y749-5150 |
| Y749-5160 |