The Seiko 5Y39-1021 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 |
| B1770L | band |
| B1770K-LKG | band - link |
| B1770L-LKG | band - link |
| B1770K | band |
| B1770L-BK4S | clasp - clasp |
| B1770K-BK4G | clasp - clasp |
| EB0055B01 | others - crown and stem gasket |
| 0351670 | others - winding stem |
| 10T11DCH | others - hour hand |
| 1BA075A1BNG | others - hour hand |
| 81180249 | others - bracelet fixing pipe |
| 81606539 | others - bracelet fixing pin |
| 0801738 | others - date dial |
| 0801740 | others - date dial |
| 0801741 | others - date dial |
| 5Y391020 | others - case back |
| 5Y39102175 | others - case |
| 5Y3910217H | others - case |
| 5Y391031XB14 | others - dial |
| 5Y391031XG14 | others - dial |
| 5Y391031XS14 | others - dial |
| 5Y391091XS24 | others - dial |
| 5Y396B | others - machine code |
| 82810370 | others - case ring |
| 10T11DCM | others - minute hand |
| 2BA110A1BNG | others - minute hand |
| 11T07NGM | others - minute hand |
| 11T07NGH | others - hour hand |