The Seiko 5Y31-100A is a watch model based on the 5Y31 movement.
Parts List
| 230W21HK01 | crystal |
| 30MC7NG1 | crown |
| 0F200BAA3 | case back gasket - case back gasket |
| GB08B | band - metal band |
| 09SC27NG | others - second hand |
| 3BA125F1BNG | others - second hand |
| 0D005BA13 | others - crown and stem gasket |
| 0351671 | others - winding stem |
| 08T35NGH | others - hour hand |
| 5Y31100A | others - case back |
| 5Y31100A75 | others - case |
| 5Y311010XS24 | others - dial |
| 5Y3161 | others - machine code |
| 82801390 | others - case ring |
| A170BS | others - push pin |
| 09T59NGM | others - minute hand |
| 2BA095F5BNG | others - minute hand |