The Seiko Y131-641A is a watch model based on the Y131 movement.
Parts List
| 265W52LN01 | crystal |
| 35MS2NG1 | crystal |
| 0G280BA12 | case back gasket |
| 86575960 | crystal gasket |
| 119LD | band - leather band |
| A150BS | others - push pin |
| 0354786 | others - winding stem |
| AD006BA12 | others - crown gasket |