The Seiko W620-4200 is a watch model based on the W620 movement.
Parts List
| ES0P39L20A | crystal - crystal |
| ES0P39L20B | crystal - crystal |
| ES0P39L20C | crystal - crystal |
| 0F240BA1S | case back gasket - case back gasket |
| 86601270 | crystal gasket - plastic gasket for crystal |
| 80710310 | pusher - button |
| 80604509 | pusher - button |
| F0V6AB | band - band |
| F0V7AB | band - band |
| 82836970 | others - case ring |
| W620420079A | others - case |
| W6204200 | others - case back |
| W620420079B | others - case |
| W620420079C | others - case |
| B090BS | others - push pin |
| 83200273 | others - button spring clip |
| AD006BA11 | others - crown and stem gasket |
| 81351639 | others - button spring |
| 81400709 | others - button spring clip |
| 81350540 | others - button spring |
| EG0060B01 | others - button gasket |