The Seiko 2P20-5640 is a watch model based on the 2P20 movement.
Parts List
| SAFN87AN01 | crystal |
| SAFN87AN | crystal |
| 30N63NA1 | crown - crown |
| 30ND3NA1 | crown - crown |
| 0G1700B0 | case back gasket |
| AC004BA1 | case back gasket |
| 0G1700B01 | case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| M5039G | band - metal band |
| M5039G-BK3G | clasp - clasp |
| 2CE060L0BDG | others - minute hand |
| 06Y07DGH | others - hour hand |
| 05Y01DGH | others - hour hand |
| 82803670 | others - case ring |
| B090AS | others - push pin |
| 2P201170XG14 | others - dial |
| 2P201180XB14 | others - dial |
| 2P201180XS14 | others - dial |
| 2P201190XR14 | others - dial |
| 2P205640 | others - case back |
| 2P20564025 | others - case |
| 06Y07DGM | others - minute hand |
| 06Y05DGM | others - minute hand |
Caliber 2P20
