The Seiko Y131-5820 is a watch model based on the Y131 movement.
Parts List
| ESHN52LN01 | crystal - crystal (inorganic) |
| 35MP8NF1 | crown |
| 0H2600B01 | case back gasket - case back gasket |
| 217LZ | band - leather band |
| 220LZ | band - leather band |
| 222LZ | band - leather band |
| 12SC50TG | others - second hand |
| 08CR4NGM | others - minute hand |
| 0354786 | others - winding stem |
| A180BS | others - push pin |
| EZ0058B01 | others - crown and stem gasket |
| 08CR0NGM | others - minute hand |
| 08CR0NGH | others - hour hand |
| 08CP8NGH | others - hour hand |