The Seiko W204-4020 is a watch model based on the W204 movement.
Parts List
| ES0Y03AM60 | crystal |
| ESMN51AM40 | crystal |
| ESMN51AM50 | crystal |
| ESMN51AM10 | crystal |
| 0D006BA13 | case back gasket |
| 0E178BE11 | case back gasket |
| 80607518 | pusher |
| 80607538 | pusher |
| 526LF | band - leather band |
| 528LF | band - leather band |
| 540LF | band - leather band |
| A100BS | others - push pin (for mb) |
| 0D006BA11 | others - pusher gasket |
Other models with the same movement
| W204-4030 |
| W204-4040 |
| W204-4050 |
| W204-4060 |
| W204-4070 |
| W204-4100 |
| W204-4120 |
| W204-4130 |
| W204-4140 |
| W204-4220 |
| W204-4240 |
| W204-4260 |
| W204-4270 |
| W204-4320 |
| W204-4340 |
| W204-4350 |