The Seiko 2P21-5090 is a watch model based on the 2P21 movement.
Parts List
| REFN11JN01 = NL | crystal |
| 30N63NA1 | crown - crown |
| 30ND3NA1 | crown - crown |
| 0G1820B01 | case back gasket |
| N5013G | band - metal band |
| N5013G-BK3G | clasp - clasp |
| 05T21DGM | hand - minute hand |
| 05T23DGH | hand - hour hand |
| 3BA075F1BNG | others - second hand |
| 06T07DGH | others - hour hand |
| 06SC15NG | others - second hand |
| DZ0040B01 | others - crown and stem gasket |
| 06SC11NG | others - second hand |
| 2P210170XY14 | others - dial |
| 2P210310XG14 | others - dial |
| 2P210310XR14 | others - dial |
| 2P210320XG14 | others - dial |
| 2P210320XY14 | others - dial |
| 2P215090 | others - case back |
| 2P21509025 | others - case |
| 2P219 | others - machine code |
| 82800950 | others - case ring |
| A110AS | others - push pin |
| 06T07DGM | others - minute hand |
Caliber 2P21
