The Seiko W621-4A20 is a watch model based on the W621 movement.
Parts List
| RE3A18JY0B | crystal - crystal |
| 0F270NA1S | case back gasket - case back gasket |
| A40A06SMS0A | pusher - button |
| C35A01SES0A | pusher - front button |
| 71A7ZZ | band - band |
| 71A7ZZ-LK2 | band - link |
| 71A7ZZ-BKB | clasp - buckle |
| 71A7ZZ-PB1 | clasp - parts for buckle |
| A160BS | others - push pin |
| W62145 | others - machine code |
| 82805260 | others - case ring |
| W6214A2079 | others - case |
| 83200273 | others - button spring clip |
| 81351630 | others - button spring |
| AD006BAD1 | others - crown and stem gasket |
Other models with the same movement