The Seiko 5Y31-500A is a watch model based on the 5Y31 movement.
Parts List
| ES8N18GN00 | crystal |
| ES8N18GN | crystal |
| 30MA6NA1 | crown - crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0H2600N01 | case back gasket - case back gasket |
| 0G0055B0 | case back gasket |
| B1676G | band |
| B1676G-BK5G | clasp - clasp |
| 09T04N1H | others - hour hand |
| 0351670 | others - winding stem |
| 5Y31500A25 | others - case |
| 5Y315710XG14 | others - dial |
| 5Y319 | others - machine code |
| 82804140 | others - case ring |
| A170BS | others - push pin |
| 2BA090A0BNG | others - minute hand |
| 13SC04A2 | others - second hand |
| 09T18NGM | others - minute hand |