The Seiko 5P31-5320 is a watch model based on the 5P31 movement.
Parts List
| RE3W11JN01 | crystal - crystal |
| 35M17NS1 | crown |
| 35M17NA1 | crown |
| 0F240BAA3 | case back gasket - case back gasket |
| AL18B | band - band |
| AL17B | band - band |
| AK04D | band - band |
| 3BA125F1BNG | others - second hand |
| 09SC27NG | others - second hand |
| 09SC27NS | others - second hand |
| 3BA125F1BNS | others - second hand |
| 09T13A2M | others - minute hand |
| 1BA060A1BAH | others - hour hand |
| 2BA090A1BAH | others - minute hand |
| 09T13A1H | others - hour hand |
| 09T13A1M | others - minute hand |
| 09T13A2H | others - hour hand |
| 1BA060A1BAF | others - hour hand |
| 2BA090A1BAF | others - minute hand |
| EB0055B01 | others - crown and stem gasket |
| 0351671 | others - winding stem |
| 5P3153207EA | others - case |
| 5P3153207E | others - case |
| 5P315450XS14 | others - dial |
| 5P315450XS23 | others - dial |
| 5P315470XG14 | others - dial |
| 5P3161 | others - machine code |
| A180BS | others - push pin |
| 5P31532075 | others - case |
| 82833350 | others - case ring |
| 5P315320 | others - case back |