The Seiko 2P20-5550 is a watch model based on the 2P20 movement.
Parts List
| REGN29JM01 | crystal |
| REGN29JV | crystal |
| REGN29JV01 | crystal |
| 30N63NA1 | crown - crown |
| AC004BA1 | case back gasket |
| 0G1890B02 | case back gasket - case back gasket |
| 0G1890B0 | case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| G5080S | band - metal band |
| G5081G | band - metal band |
| G5081G-BK5G | clasp - clasp |
| G5080S-BK5S | clasp - clasp |
| 05Y25DGH | hand - hour hand |
| 1CE037LABDG | others - hour hand |
| 2P200960XG14 | others - dial |
| 2P200980X984 | others - dial |
| 2P200980X994 | others - dial |
| 2P200980XG14 | others - dial |
| 2P200990XL14 | others - dial |
| 2P205550 | others - case back |
| 2P20555025 | others - case |
| 2P20555029 | others - case |
| 82803090 | others - case ring |
| A100AS | others - push pin |
| 05Y05DGH | others - hour hand |
| 05Y05DGM | others - minute hand |
| 05Y01DGM | others - minute hand |
| 05Y03DGH | others - hour hand |
Caliber 2P20
