The Seiko W307-4050 is a watch model based on the W307 movement.
Parts List
| SAAW76AU01 | crystal - crystal |
| SAAW76AU02 | crystal |
| SAAW76AU03 | crystal |
| 0Z2900B01 | bezel gasket - dichtung |
| EC0060B01 | pusher - pusher gasket |
| 8060534A | pusher |
| 035LH | band - band |
| 041LH | band - resin band |
| 037LH | band |
| 039LH | band |
| W3074050N2 | others - case |
| A190CS | others - push pin |
| 81350540 | others - button spring |
| 83200271 | others - button spring clip |
| 81400683 | others - button spring clip |
Other models with the same movement
| W307-4000 |
| W307-4010 |
| W307-4020 |
| W307-4030 |
| W307-4040 |
| W307-4060 |
| W307-4070 |
| W307-4090 |
| W307-4130 |
| W307-4A00 |
| W307-4A10 |