The Seiko 2B20-5020 is a watch model based on the 2B20 movement.
Parts List
| ET3N37LN01 | crystal |
| 35NK3NN1 | crown |
| 35NK3NS1 | crown |
| 0F150NA11 | case back gasket - case back gasket |
| DH0100B01 | case back gasket - crown and stem gasket (4h) |
| 0F150NA1 | case back gasket |
| B5441G | band - metal band |
| B5441S | band - metal band |
| B5441G-BK5G | clasp - clasp |
| 1DA035A3BNS | hand - hour hand |
| 1DG035LABNG | others - hour hand |
| 1DG037LABNG | others - hour hand |
| 2DG052LABNG | others - minute hand |
| 05R01DSM | others - minute hand |
| 05R07NGH | others - hour hand |
| 2B200180XG14 | others - dial |
| 2B200190XB14 | others - dial |
| 2B200190XG14 | others - dial |
| 2B200200XG14 | others - dial |
| 2B200200XN14 | others - dial |
| 2B200200XN24 | others - dial |
| 2B200200XS13 | others - dial |
| 2B200210XG14 | others - dial |
| 2B200210XN14 | others - dial |
| 2B200210XN24 | others - dial |
| 2B200210XS13 | others - dial |
| 2B200220XB14 | others - dial |
| 2B200220XG14 | others - dial |
| 2B200220XS14 | others - dial |
| 2B200230XB14 | others - dial |
| 2B200230XG14 | others - dial |
| 2B200230XS14 | others - dial |
| 2B2027 | others - machine code |
| 2B205020 | others - case back |
| 2B20502025 | others - case |
| 2B20502029 | others - case |
| 82812790 | others - case ring |
| B080AS | others - push pin |
| 05R01DGM | others - minute hand |
| 05R37NGM | others - minute hand |
| 05R37NGH | others - hour hand |
| 1DA035A3BNG | others - hour hand |
| 2DA052A3BDG | others - minute hand |
| 2DA052A3BNG | others - minute hand |
Caliber 2B20




Other models with the same movement
| 2B20-5000 |
| 2B20-5009 |
| 2B20-5010 |
| 2B20-5019 |
| 2B20-5039 |
| 2B20-5049 |
| 2B20-5059 |