The Seiko W620-4180 is a watch model based on the W620 movement.
Parts List
| K00P11LN02 | crystal - crystal |
| 0F240BA1S | case back gasket - case back gasket |
| 86601250 | crystal gasket - plastic gasket for crystal |
| 80604509 | pusher - button |
| 80633730 | pusher - front button |
| E099AQ | band - band |
| E0A0AB | band - band |
| 83151639 | others - button spring(center) |
| 82836970 | others - case ring |
| W620418079A | others - case |
| W620418079B | others - case |
| W620418079C | others - case |
| W620418079D | others - case |
| W620418079E | others - case |
| T080BS | others - push pin |
| W62031 | others - machine code |
| W62041809959 | others - panel cover |
| W62041809969 | others - panel cover |
| W62041809979 | others - panel cover |
| W62041809989 | others - panel cover |
| W62041809999 | others - panel cover |
| AD006BA11 | others - crown and stem gasket |
| 83200219 | others - button spring clip |
| 81351639 | others - button spring |
| 81400709 | others - button spring clip |
| 81350540 | others - button spring |
| EG0060B01 | others - button gasket |