The Seiko Y131-5420 is a watch model based on the Y131 movement.
Parts List
| 35M78NH1 | crystal |
| SA7W74GN00 | crystal |
| FH2580B01 | case back gasket |
| 86575300 | crystal gasket |
| AL95B | band - leather band |
| 09C38ANH | others - hour hand |
| 0354786 | others - winding stem |
| A160BS | others - push pin |
| 09C38ANM | others - minute hand |
| 0Z0060B01 | others - crown and stem gasket |