The Seiko V821-0420 is a watch model based on the V821 movement.
Parts List
| 35M37NN1 | crown - crown |
| 35M37NS1 | crown |
| 0G180BA11 | case back gasket - case back gasket |
| DB0055B01 | case back gasket - crown and stem gasket |
| FEL9MZ | band - band |
| FDA6KZ | band - leather band |
| FDA8KZ | band - leather band |
| FD55JB | band - band |
| FCR2MB | band - band |
| FDC2KZ | band - leather band |
| FE04KZ | band - leather band |
| FEL8MZ | band - band |
| 08SH01NG | others - second hand |
| 08SH01NS | others - second hand |
| 1HA060A5BNG | others - hour hand |
| 1HA060A5BNS | others - hour hand |
| 2HA080AABNG | others - minute hand |
| 2HA080AABNS | others - minute hand |
| 3HA090F1BAK | others - second hand |
| 3HX077FABAB | others - second hand |
| T120BS | others - push pin |
| V8210420N0B | others - case |
| V8210420N0C | others - case |
| V8210420N0A | others - case |
| 0354122 | others - winding stem |