The Seiko 5Y31-5050 is a watch model based on the 5Y31 movement.
Parts List
| SAAW20JM | crystal |
| SAAW20JM01 | crystal |
| 35MA8NA1 | crown |
| 0A2600N01 | case back gasket - case back gasket |
| G1325C | band - metal band |
| G1325G | band - metal band |
| G1325G-BK5G | clasp - clasp |
| G1325C-BK5S | clasp - clasp |
| 0351670 | others - winding stem |
| 5Y315050 | others - case back |
| 5Y31505075 | others - case |
| 5Y3150507H | others - case |
| 5Y315240XG14 | others - dial |
| 5Y315250X994 | others - dial |
| 5Y319 | others - machine code |
| 82811160 | others - case ring |
| A160BS | others - push pin |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
| 08T48DAM | others - minute hand |
| 08T32DAM | others - minute hand |
| 08T48DAH | others - hour hand |
| 08T32DAH | others - hour hand |