The Seiko 3Y03-020A is a watch model based on the 3Y03 movement.
Parts List
| 185P01LN03 | crystal - crystal (inorganic) |
| 185P01LN | crystal |
| 35MS1NN1 | crown - crown |
| 0F160BAA5 | case back gasket - case back gasket |
| 0F160BAA | case back gasket |
| 86561070 | crystal gasket |
| 86561930 | bezel gasket |
| Z5425G | band |
| Z5425G-LKG | band - link |
| Z5425G-PB1 | clasp - parts for buckle/clasp |
| Z5425G-BK1G | clasp - clasp |
| 3BA075F1BNG | others - second hand |
| 07SC17NG | others - second hand |
| 0351546 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 0801941 | others - date dial |
| 0884155 | others - holding ring for dial |
| 3Y03020A | others - case back |
| 3Y03020A75 | others - case |
| 3Y030370XB14 | others - dial |
| 82351551 | others - bezel |
| 82820510 | others - case ring |
| B090BS | others - push pin |
| 07T53NGM | others - minute hand |
| 07T53NGH | others - hour hand |