The Seiko 5Y31-5A90 is a watch model based on the 5Y31 movement.
Parts List
| SAGN33JN01 | crystal |
| SAGN33JN | crystal |
| 32N25NN1 | crown |
| DZ0065B01 | case back gasket - button gasket |
| DZ0065B0 | case back gasket |
| 0H2600B01 | case back gasket - case back gasket |
| 0H2600B0 | case back gasket |
| BQJ33G | band |
| BQJ32G | band - leather band |
| BQA28G | band |
| 09SC27NG | others - second hand |
| 3BA125F1BNG | others - second hand |
| 1BA060A1BNG | others - hour hand |
| 5Y315A90 | others - case back |
| 5Y315A9025 | others - case |
| 5Y315C00XB14 | others - dial |
| 5Y315C10XG14 | others - dial |
| 5Y315C20XB14 | others - dial |
| 5Y315C20XS14 | others - dial |
| 5Y315C30XG14 | others - dial |
| 5Y3161 | others - machine code |
| 82820750 | others - case ring |
| A190BS | others - push pin |
| 09SC31NG | others - second hand |
| 09T13NGM | others - minute hand |
| 2BA090A1BNG | others - minute hand |
| 08T17DGM | others - minute hand |
| 08T17DGH | others - hour hand |