The Seiko 5Y31-5309 is a watch model based on the 5Y31 movement.
Parts List
| ESBW36JM01 | crystal |
| ESBW36JM | crystal |
| 35M82NA1 | crown - crown |
| 0A2600B01 | case back gasket |
| Z1511K-LKG | band - link |
| Z1511K | band |
| Z1511K-BK4G | clasp - clasp |
| A120BS | others - push pin (for lb) |
| 5Y315309 | others - case back |
| 5Y31530975 | others - case |
| 5Y315638XB14 | others - dial |
| 5Y319 | others - machine code |
| 82804140 | others - case ring |
| 0351670 | others - winding stem |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
| 09TC0DGM | others - minute hand |
| 09TC0DGH | others - hour hand |