The Seiko W621-4A00 is a watch model based on the W621 movement.
Parts List
| RE3A18JZ0B | crystal - crystal |
| 0F270NA1S | case back gasket - case back gasket |
| A40A06SMS0A | pusher - button |
| C35A01SMS0A | pusher - button (2h) |
| F142JZ | band - band |
| W6214A0079Z | others - case |
| 82805260 | others - case ring |
| A160BS | others - push pin |
| 83200273 | others - button spring clip |
| 81351630 | others - button spring |
| AD006BAD1 | others - crown and stem gasket |
Other models with the same movement
| W621-4000 |
| W621-4020 |
| W621-4040 |
| W621-4A10 |
| W621-4A20 |
| W621-4A30 |