The Seiko W850-4000 is a watch model based on the W850 movement.
Parts List
| K00P27L20C | crystal - crystal |
| K00P39J20A | crystal - crystal |
| K00P39J20B | crystal - crystal |
| K00P39J20C | crystal - crystal |
| K00P39J20D | crystal - crystal |
| 0F309BEA1 | case back gasket - case back gasket |
| 86640830 | crystal gasket - plastic gasket for crystal |
| FF25AB | band - band |
| FF26AB | band - band |
| FF27AB | band - band |
| FEG1AB | band - band |
| FEG2AB | band - band |
| FEG3AB | band - band |
| FEG4AB | band - band |
| FEG5AB | band - band |
| FET7AB | band - band |
| W8504000SLH | others - case |
| W8504000SLJ | others - case |
| W8504000SLK | others - case |
| W8504000SLF | others - case |
| T120BS | others - push pin |
| AD006BA11 | others - crown and stem gasket |
| W8504000SLE | others - case |
| W8504000SLD | others - case |
| W8504000SLC | others - case |
| W8504000SLB | others - case |
| W8504000SLA | others - case |
Other models with the same movement