The Seiko 5P31-5B70 is a watch model based on the 5P31 movement.
Parts List
| SA9W26HN | crystal |
| SA9W26HN01 | crystal |
| 35M82NA1 | crown - crown |
| 0A2600N01 | case back gasket - case back gasket |
| 86580760 | crystal gasket |
| B1503C | band - metal band |
| B1503C-LKG | band - link |
| B1503D | band - metal band |
| B1503D-LKG | band - link |
| B1503G | band - metal band |
| B1503G-LKG | band - link |
| B1503G-BK4G | clasp - clasp |
| B1503D-BK4G | clasp - clasp |
| B1503C-BK4G | clasp - clasp |
| 09T04N1H | others - hour hand |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 82804980 | others - case ring |
| 5P315B70 | others - case back |
| 5P315B7075 | others - case |
| 5P315B7098 | others - case |
| 5P315B70XF | others - case |
| 5P315C50XB14 | others - dial |
| 5P315C50XG14 | others - dial |
| 5P315C50XS14 | others - dial |
| 5P319 | others - machine code |
| 0351670 | others - winding stem |
| 2BA090A0BNG | others - minute hand |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
| 09T18NGM | others - minute hand |