The Seiko W620-4220 is a watch model based on the W620 movement.
Parts List
| SA2A77L20A | crystal - crystal |
| SA2A77L20B | crystal - crystal |
| SA2A77L20C | crystal - crystal |
| 0F240BA1S | case back gasket - case back gasket |
| 80710415 | pusher - button |
| 80710370 | pusher - button |
| 80710375 | pusher - button |
| 80710376 | pusher - button |
| 80710410 | pusher - button |
| 80710416 | pusher - button |
| FDV2AB | band - band |
| FDV1AB | band - band |
| FDV3AB | band - band |
| W62042206ZA | others - case |
| W62042206ZB | others - case |
| 83200273 | others - button spring clip |
| AD006BA11 | others - crown and stem gasket |
| 81351639 | others - button spring |
| 82836970 | others - case ring |
| W62042206ZC | others - case |
| T200BS | others - push pin |
| W62050 | others - machine code |