The Seiko 7431-0020 is a watch model based on the 7431 movement.
Parts List
| 330N11KN00 | crystal - crystal (inorganic) |
| 45N25NS1 | crown - crown |
| 45N25NN1 | crown - crown |
| DA0070B01 | case back gasket - crown and stem gasket |
| 0H2700B01 | case back gasket - case back gasket |
| AC15S | band - band |
| AC150 | band - band |
| 12P01ASH | others - hour hand |
| 12P01ASM | others - minute hand |
| 1AA085A1BAC | others - hour hand |
| 12P01AGH | others - hour hand |
| 12P01AGM | others - minute hand |
| 2AA125A1BAA | others - minute hand |
| 13SC09T1 | others - second hand |
| 3AA125F3A6S | others - second hand |
| 3AA125F3ANG | others - second hand |
| 0354083 | others - winding stem |
| 7431002026 | others - case |
| 83138590 | others - case ring |
| 7431002011 | others - case |
| 74310020XS17 | others - dial |
| 74310020XS18 | others - dial |
| 74310030XG19 | others - dial |
| 74310030XS19 | others - dial |
| 74310050XS14 | others - dial |
| 743110 | others - machine code |
| 81871773 | others - case bow |
| 81871774 | others - case bow |
| 13SC09T2 | others - second hand |
| 2AA125A1BAC | others - minute hand |
| 1AA085A1BAA | others - hour hand |
Caliber 7431
