The Seiko 5P31-5B8A is a watch model based on the 5P31 movement.
Parts List
| SA9W34HN01 | crystal |
| 35MA8NB1 | crown |
| 0A2500N01 | case back gasket - rotating bezel gasket |
| 86580860 | crystal gasket |
| NK56A | band - leather band |
| 5P315B8A | others - case back |
| 5P315B8A75 | others - case |
| 5P315C70XB12 | others - dial |
| 5P319 | others - machine code |
| 82810500 | others - case ring |
| A170BS | others - push pin |
| 09T08NGH | others - hour hand |
| 0351670 | others - winding stem |
| 09T08NGM | others - minute hand |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |