The Seiko Y131-5100 is a watch model based on the Y131 movement.
Parts List
| BA1N06AN00 | crystal |
| 35MB0NC1 | crown |
| 35MB0NF1 | crown |
| 0A2800B01 | case back gasket |
| AL78B | band - leather band |
| AL79B | band - leather band |
| A200BS | others - push pin |
| 0354786 | others - winding stem |
| 11C16NSH | others - hour hand |
| 11C16NSM | others - minute hand |
| EZ0058B01 | others - crown and stem gasket |
| 13SC04A2 | others - second hand |
| 13SC04ES | others - second hand |
| 11C16NGM | others - minute hand |
| 11C16NGH | others - hour hand |