The Seiko W339-4A20 is a watch model based on the W339 movement.
Parts List
| EG0115B01 | case back gasket - button gasket |
| 0Z2900B01 | bezel gasket - dichtung |
| 8061806A | pusher - button |
| 8061808A | pusher - button(10h) |
| JL86D | band - leather band |
| T200CS | others - push pin |
Other models with the same movement
| W339-4A08 |
| W339-4A10 |
| W339-4A30 |
| W339-4A40 |
| W339-4A48 |
| W339-4A50 |
| W339-4A60 |
| W339-4A68 |
| W339-4A70 |
| W339-4A90 |
| W339-4B00 |
| W339-4B10 |
| W339-4B20 |
| W339-4B30 |
| W339-4B40 |
| W339-4B50 |
| W339-4B60 |
| W339-4B70 |
| W339-4B80 |
| W339-4B90 |
| W339-4C00 |
| W339-4C10 |