The Seiko 5P31-508A is a watch model based on the 5P31 movement.
Parts List
| RE1W21HN01 | crystal |
| RE1W21HN | crystal |
| 35M77NA1 | crown |
| 0F230BAA | case back gasket |
| 0F230BAA3 | case back gasket - case back gasket |
| 86581690 | crystal gasket - plastic gasket for crystal |
| B1486G | band - metal band |
| B1487C | band - metal band |
| B1487G | band - metal band |
| B1487G-BK3G | clasp - clasp |
| B1487C-BK3G | clasp - clasp |
| B1486G-BK3G | clasp - clasp |
| 1BE055LABDG | others - hour hand |
| 3BA075F1BNG | others - second hand |
| 3BA125F1BNG | others - second hand |
| 07SC17NG | others - second hand |
| A100BS | others - push pin (for mb) |
| 5P315080 | others - case back |
| 5P31508A75 | others - case |
| 5P31508A7H | others - case |
| 5P315120XG1S | others - dial |
| 5P315130XG16 | others - dial |
| 5P315140XG14 | others - dial |
| 82803110 | others - case ring |
| EB0055B01 | others - crown and stem gasket |
| EB0055B0 | others - crown gasket |
| 08T01DGH | others - hour hand |
| 08SC29NG | others - second hand |
| 08T05DGM | others - minute hand |
| 07T01DGM | others - minute hand |
| 07T01DGH | others - hour hand |