The Seiko 5Y39-6B20 is a watch model based on the 5Y39 movement.
Parts List
| 245W27HM01 | crystal |
| 245W27HM | crystal |
| 32M31NN1 | crown |
| 0F220BAA3 | case back gasket - case back gasket |
| 0F220BAA | case back gasket |
| 86592090 | crystal gasket |
| Z1587C | band |
| Z1587C-LKG | band - link |
| Z1587G-LKG | band - link |
| Z1587G | band |
| Z1587C-BK4G | clasp - clasp |
| Z1587G-BK4G | clasp - clasp |
| A120BS | others - push pin (for lb) |
| 0801740 | others - date dial |
| 5Y396B | others - machine code |
| 5Y396B20 | others - case back |
| 5Y396B2075 | others - case |
| 5Y396B207H | others - case |
| 5Y396B20XB14 | others - dial |
| 5Y396B20XG14 | others - dial |
| 5Y396B20XG24 | others - dial |
| 82812450 | others - case ring |
| 0351670 | others - winding stem |
| EB0055B01 | others - crown and stem gasket |
| 10T25DGM | others - minute hand |
| 10T25DGH | others - hour hand |