The Seiko 2P20-5820 is a watch model based on the 2P20 movement.
Parts List
| REHN23HR01 | crystal |
| 30N63NG1 | crown |
| 30ND3NH1 | crown - crown |
| 0D205BA11 | case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| B5412H | band - metal band |
| B5412H-LKG | band - link |
| B5412H-BK4G | clasp - clasp |
| 06Y09DGH | hand - hour hand |
| 2P201530XB14 | others - dial |
| 2P205820 | others - case back |
| 2P205820JJ | others - case |
| 82812230 | others - case ring |
| A120AS | others - push pin |
| 2CG055L0BDG | others - minute hand |
| 05Y07DGM | others - minute hand |
Caliber 2P20
