The Seiko 5Y31-5090 is a watch model based on the 5Y31 movement.
Parts List
| BA2W40JM01 | crystal |
| 35MA8NA1 | crown |
| 0A2800N01 | case back gasket - case back gasket |
| 0A2800N | case back gasket |
| Z1440S | band - metal band |
| Z1440G | band |
| Z1440G-BK5G | clasp - clasp |
| 0351670 | others - winding stem |
| 5Y315090 | others - case back |
| 5Y31509075 | others - case |
| 5Y31509079 | others - case |
| 5Y315330XG14 | others - dial |
| 5Y315330XN14 | others - dial |
| 5Y319 | others - machine code |
| 82811440 | others - case ring |
| A180BS | others - push pin |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
| 09T38DAM | others - minute hand |
| 09T32DAH | others - hour hand |