The Seiko 7731-5180 is a watch model based on the 7731 movement.
Parts List
| SAEN65SN00 | crystal - crystal |
| 30N59DA5 | crown - crown |
| 0F240NA11 | case back gasket |
| JK22A | band - band |
| 09SC21VG | others - second hand |
| 0354371 | others - winding stem |
| 773151804FA | others - case |
| 82720010 | others - case ring |
| 77315210XG14 | others - dial |
| 773162 | others - machine code |
| A180BS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 10P67DGM | others - minute hand |
| 10P67DGH | others - hour hand |