The Seiko 5Y39-1020 is a watch model based on the 5Y39 movement.
Parts List
| 260P01HN03 | crystal - crystal |
| 260P01HN | crystal |
| 35M65NA1 | crown |
| 0F210BAA3 | case back gasket |
| 0F210BAA | case back gasket |
| 86570350 | crystal gasket - plastic gasket for crystal |
| B1770G | band |
| B1770G-LKG | band - link |
| B1770G-BK4G | clasp - clasp |
| 1BG080LABDG | others - hour hand |
| 81180249 | others - bracelet fixing pipe |
| 81606539 | others - bracelet fixing pin |
| 0801740 | others - date dial |
| 5Y391020 | others - case back |
| 5Y39102075 | others - case |
| 5Y391070XB14 | others - dial |
| 5Y391070XG14 | others - dial |
| 5Y396B | others - machine code |
| 5Y396C | others - machine code |
| 82810370 | others - case ring |
| EB0055B01 | others - crown and stem gasket |
| 0351670 | others - winding stem |
| 10T09DGH | others - hour hand |
| 10T09DGM | others - minute hand |