The Seiko 5Y31-8A00 is a watch model based on the 5Y31 movement.
Parts List
| 285N19JV01 | crystal |
| 285N19JV | crystal |
| 30N97NN1 | crown |
| 0H2650B01 | case back gasket |
| 0H2650B0 | case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| ZPJ24G | band |
| ZPA46G | band - leather band |
| ZPJ31G | band - leather band |
| ZPJ32G | band - leather band |
| ZPS02G | band - leather band |
| ZPJ23G | band |
| ZPA40G | band |
| 1BE075LABDG | others - hour hand |
| 11T25DGM | others - minute hand |
| 3AA125F1ANG | others - second hand |
| 11SC43T1 | others - second hand |
| 3AA125F3ANG | others - second hand |
| 2BA120A1BNG | others - minute hand |
| 1BE070LABDG | others - hour hand |
| 2BE100LABDG | others - minute hand |
| 82732490 | others - case ring |
| 5Y318A00 | others - case back |
| 5Y318A0025 | others - case |
| 5Y318A002N | others - case |
| 5Y318A20XB14 | others - dial |
| 5Y318A20XS14 | others - dial |
| 5Y318A30XG14 | others - dial |
| 5Y318A40XB14 | others - dial |
| 5Y318A40XS14 | others - dial |
| 5Y318A60XG14 | others - dial |
| 5Y318A70XR15 | others - dial |
| A180BS | others - push pin |
| 0351671 | others - winding stem |
| 10T25DGM | others - minute hand |
| 10T25DGH | others - hour hand |
| 10SC23T1 | others - second hand |
| 12SC23T1 | others - second hand |
| 12T07NGM | others - minute hand |
| 1BA080A1BNG | others - hour hand |
| 12T07NGH | others - hour hand |