The Seiko 5Y31-8000 is a watch model based on the 5Y31 movement.
Parts List
| 290N22GN00 | crystal - crystal |
| 30MA6NA1 | crown - crown |
| 0A2600N01 | case back gasket - case back gasket |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0G0055B0 | case back gasket |
| Z1475K | band |
| Z1476K | band |
| Z1493G | band |
| Z1475K-BK5G | clasp - clasp |
| Z1476K-BK5G | clasp - clasp |
| Z1493G-BK5G | clasp - clasp |
| 1BB080A0BNG | others - hour hand |
| 82803220 | others - case ring |
| 5Y318000 | others - case back |
| 5Y31800025 | others - case |
| 5Y318008XG14 | others - dial |
| 5Y318018X914 | others - dial |
| 5Y318040XB14 | others - dial |
| 5Y318040XG14 | others - dial |
| 5Y318050X914 | others - dial |
| 5Y319 | others - machine code |
| A160BS | others - push pin |
| 0351670 | others - winding stem |
| 13SC04A2 | others - second hand |
| 11T30DAM | others - minute hand |
| 12T36CBM | others - minute hand |
| 12T08NGM | others - minute hand |
| 12T08NGH | others - hour hand |
| 12T36CBH | others - hour hand |
| 11T30DAH | others - hour hand |