The Seiko 2P20-0B5A is a watch model based on the 2P20 movement.
Parts List
| 180N22JU | crystal |
| 180N22JU01 | crystal |
| 32M08NA1 | crown |
| 0H1720N0 | case back gasket |
| 0H1720N01 | case back gasket - case back gasket |
| DZ0041B0 | case back gasket |
| BHZ33E | band - leather band |
| BHZ48E | band - leather band |
| 07Y16DGH | others - hour hand |
| 07Y16DGM | others - minute hand |
| 82734640 | others - case ring |
| 2P200B5A | others - case back |
| 2P200B5AHE | others - case |
| 2P200K10X994 | others - dial |
| 2P209 | others - machine code |
| A120AS | others - push pin |
| 0351236 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
Caliber 2P20
