The Seiko W855-4020 is a watch model based on the W855 movement.
Parts List
| SA3A23L20A | crystal - crystal |
| SA3A23L20B | crystal - crystal |
| 0F260BA1S | case back gasket - case back gasket |
| C50A01SMS0 | pusher - button |
| HD9Z01SMS0 | pusher - front button |
| 7CC6WB | band - band |
| 7CC7WB | band - band |
| 81180169 | others - bracelet fixing pipe |
| 81612469 | others - bracelet fixing pin |
| 82844130 | others - case ring |
| W8554020ZNA | others - case |
| W8554020ZNB | others - case |
| W85553 | others - machine code |
| AD006BAD1 | others - crown and stem gasket |
| 81350760 | others - button spring (front) |
| 81351639 | others - button spring |
| C40A09SMS0 | others - push button(other pos.) |
| 83200273 | others - button spring clip |
Other models with the same movement