The Seiko W621-4020 is a watch model based on the W621 movement.
Parts List
| 0G300BA11 | case back gasket - case back gasket |
| FEW1AB | band - band |
| FEW2AB | band - band |
| FEW3AB | band - band |
| FE41AB | band - leather band |
| W6214020MPA | others - case |
| W6214020MPB | others - case |
| W6214020MPC | others - case |
| W62113 | others - machine code |
Other models with the same movement
| W621-4000 |
| W621-4040 |
| W621-4A00 |
| W621-4A10 |
| W621-4A20 |
| W621-4A30 |