The Seiko V401-1820 is a watch model based on the V401 movement.
Parts List
| 160A02JN02 | crystal - crystal (inorganic) |
| 6M30A5NNG0 | crown - crown |
| 0F140BA1S | case back gasket - case back gasket |
| DZ0050B01 | case back gasket |
| 4533BZ | band - band |
| 4542BZ | band - band |
| 4533BZ-LK4 | band - link |
| 4542BZ-LK4 | band - link |
| 4533BZ-BKN | clasp - buckle |
| 4542BZ-BKN | clasp - buckle |
| 3BA075F1BNG | others - second hand |
| 1AF045A1BNG | others - hour hand |
| 1AE040LMBNG | others - hour hand |
| 2AE060LABNG | others - minute hand |
| 0351155 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| V401182075A | others - case |
| 82836530 | others - case ring |
| V4011820 | others - case back |
| T060BS | others - push pin |
| V40110 | others - machine code |
| V4016120XB14 | others - dial |
| V4016120XG14 | others - dial |
| V4016120XG24 | others - dial |
| V4016130XB14 | others - dial |
| V4016130XG14 | others - dial |
| V4016130XS14 | others - dial |
| 2AF062A1BNG | others - minute hand |