The Seiko 5Y31-5220 is a watch model based on the 5Y31 movement.
Parts List
| SAAW36JM01 | crystal |
| SAAW36JM | crystal |
| 35MA8NA1 | crown |
| 0A2500N01 | case back gasket - rotating bezel gasket |
| G1373G | band |
| G1373G-BK5G | clasp - clasp |
| A120BS | others - push pin (for lb) |
| 5Y315220 | others - case back |
| 5Y31522075 | others - case |
| 5Y315550XB14 | others - dial |
| 5Y315550XG14 | others - dial |
| 5Y319 | others - machine code |
| 82801780 | others - case ring |
| 0351670 | others - winding stem |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
| 09T38DAM | others - minute hand |
| 09T32DAH | others - hour hand |