The Seiko 7731-5120 is a watch model based on the 7731 movement.
Parts List
| ESLN77SN00 | crystal - crystal |
| 30N59DA5 | crown - crown |
| 0H2300B01 | case back gasket |
| LK25B | band - band |
| 7731512025B | others - case |
| 82703770 | others - case ring |
| 7731512025C | others - case |
| 7731512025A | others - case |
| 77315120XG14 | others - dial |
| 773162 | others - machine code |
| A160BS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 0354371 | others - winding stem |
| 10SC39VG | others - second hand |
| 1AF075LABDG | others - hour hand |
| 2AF110LABDG | others - minute hand |
| 11P95DGM | others - minute hand |
| 11P95DGH | others - hour hand |