The Seiko Y131-635A is a watch model based on the Y131 movement.
Parts List
| 210N08LN01 | crystal |
| 35MP8NC1 | crown |
| 35MP8NF1 | crown |
| 0D200BA12 | case back gasket |
| DL75H | band - leather band |
| DL76H | band - leather band |
| DL93G | band - leather band |
| DL94G | band - leather band |
| DL95G | band - leather band |
| DL96G | band - leather band |
| DL97G | band - leather band |
| DL98G | band - leather band |
| 12SC50TG | others - second hand |
| A130AS | others - push pin (for lb) |
| 08CT4NBH | others - hour hand |
| 0354786 | others - winding stem |
| 09C38NGH | others - hour hand |
| 08CT4NBM | others - minute hand |
| 09C38NGM | others - minute hand |
| EZ0058B01 | others - crown and stem gasket |
| 08CV0NBH | others - hour hand |
| 08CV0NBM | others - minute hand |
| 12SC50FB | others - second hand |