The Seiko Y131-647A is a watch model based on the Y131 movement.
Parts List
| 255W50KM01 | crystal |
| 35MT0NG1 | crown |
| FH2381B01 | case back gasket - case back gasket |
| 86576145 | crystal gasket |
| AL78D | band - leather band |
| A140BS | others - push pin |
| 0354786 | others - winding stem |
| 10CP2FAM | others - minute hand |
| 12SC50XK | others - second hand |
| AD006BA12 | others - crown gasket |
| 10CT0FAH | others - hour hand |