The Seiko 5Y31-6020 is a watch model based on the 5Y31 movement.
Parts List
| 265W20JM01 | crystal |
| 290N36JM01 | crystal |
| 35MA8NA1 | crown |
| 30MA6NA1 | crown - crown |
| 0A2600N01 | case back gasket - case back gasket |
| 0A2400N01 | case back gasket - case back gasket |
| Z1487H | band |
| Z1487G | band |
| Z1487S | band |
| Z1487G-BK5G | clasp - clasp |
| Z1487H-BK5G | clasp - clasp |
| 82801940 | others - case ring |
| 82803220 | others - case ring |
| 5Y316020 | others - case back |
| 5Y31602075 | others - case |
| 5Y31602079 | others - case |
| 5Y316020WE | others - case |
| 5Y316080XB14 | others - dial |
| 5Y316080XG14 | others - dial |
| 5Y316080XG24 | others - dial |
| 5Y316080XN14 | others - dial |
| 5Y316090XB14 | others - dial |
| 5Y316140XB14 | others - dial |
| 5Y319 | others - machine code |
| A140BS | others - push pin |
| A160BS | others - push pin |
| 0351670 | others - winding stem |
| 11T08NGM | others - minute hand |
| 13SC04A2 | others - second hand |
| 11T08NGH | others - hour hand |
| 10T76DAH | others - hour hand |
| 10T86DAM | others - minute hand |
| 0Z0060B01 | others - crown and stem gasket |
| 10T76ZGM | others - minute hand |
| 10T76ZGH | others - hour hand |