The Seiko 2P20-5540 is a watch model based on the 2P20 movement.
Parts List
| REGN29JN01 | crystal |
| 30N63NA1 | crown - crown |
| 0G1890B02 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| G5081G | band - metal band |
| G5080G | band - metal band |
| G5080G-BK5G | clasp - clasp |
| G5081G-BK5G | clasp - clasp |
| 05Y01DGH | others - hour hand |
| 05Y05DGH | others - hour hand |
| 2P200960XG14 | others - dial |
| 2P200970XG14 | others - dial |
| 2P200970XR14 | others - dial |
| 2P205540 | others - case back |
| 2P20554025 | others - case |
| 82803090 | others - case ring |
| A100AS | others - push pin |
| 05Y05DGM | others - minute hand |
| 05Y01DGM | others - minute hand |
Caliber 2P20
