The Seiko 5P31-5100 is a watch model based on the 5P31 movement.
Parts List
| BA2W93HN01 | crystal |
| 35M81NA1 | crown |
| 0F220BAA3 | case back gasket - case back gasket |
| 86582170 | crystal gasket - plastic gasket for crystal |
| B1504G | band - metal band |
| B1504G-BK5G | clasp - clasp |
| 09T03DCM | hand - minute hand |
| 3BA125F1BNG | others - second hand |
| EB0055B01 | others - crown and stem gasket |
| 5P315100 | others - case back |
| 5P31510075 | others - case |
| 5P315160XG14 | others - dial |
| 82810130 | others - case ring |
| A160BS | others - push pin |
| 09SC31NG | others - second hand |
| 09T11DGH | others - hour hand |