The Seiko V401-1639 is a watch model based on the V401 movement.
Parts List
| 190A02J20B | crystal - crystal |
| 190A02J2 | crystal |
| 6M30A3NNG0 | crown - crown |
| 6M30A3NN | crown |
| 0F160BA1 | case back gasket |
| 0F160BA1S | case back gasket - case back gasket |
| 43Y1XG | band - band |
| 43Y1XG-LKG | band - link |
| 43Y1XG-BK4G | clasp - buckle |
| 3BA075F1BNG | others - second hand |
| A120BS | others - push pin (for lb) |
| V40110 | others - machine code |
| V4014661XL14 | others - dial |
| 82818070 | others - case ring |
| V401163979A | others - case |
| V4011639 | others - case back |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 2AG075LABDG | others - minute hand |
| 1AG050LABDG | others - hour hand |