The Seiko 2B20-5039 is a watch model based on the 2B20 movement.
Parts List
| ET3N39LN01 | crystal |
| 35NK3NN1 | crown |
| 0F140NA11 | case back gasket |
| DH0100B01 | case back gasket - crown and stem gasket (4h) |
| 0E140BA1 | case back gasket |
| Z5247G | band - metal band |
| Z5247G-LKG | band - link |
| Z5247G-PB1 | clasp - parts for buckle/clasp |
| Z5247G-BK4G | clasp - clasp |
| Z5247G-ES | others - eyelet screw |
| 81181459 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 2B200240XS14 | others - dial |
| 2B2027 | others - machine code |
| 2B205039 | others - case back |
| 2B20503925 | others - case |
| 82812850 | others - case ring |
| 2DA045A3BDG | others - minute hand |
| 05R13DGM | others - minute hand |
| 1DA030A3BNG | others - hour hand |
Caliber 2B20
Other models with the same movement
| 2B20-5000 |
| 2B20-5009 |
| 2B20-5010 |
| 2B20-5019 |
| 2B20-5020 |
| 2B20-5049 |
| 2B20-5059 |