The Seiko 5P31-5B80 is a watch model based on the 5P31 movement.
Parts List
| SA9W34HN01 | crystal |
| 35MA8NA1 | crown |
| 0A2500N01 | case back gasket - rotating bezel gasket |
| 86580860 | crystal gasket |
| LK10D | band - leather band |
| NK55A | band - leather band |
| 5P315B80 | others - case back |
| 5P315B8075 | others - case |
| 5P315C60XS19 | others - dial |
| 5P315C70XS19 | others - dial |
| 5P319 | others - machine code |
| 82810500 | others - case ring |
| A170BS | others - push pin |
| 09T08FGH | others - hour hand |
| 0351670 | others - winding stem |
| 09T08FGM | others - minute hand |
| 09T36AGM | others - minute hand |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
| 10T32ALH | others - hour hand |