The Seiko 2P21-5180 is a watch model based on the 2P21 movement.
Parts List
| SAGN13JN01 | crystal |
| 30N63NA1 | crown - crown |
| 30ND3NA1 | crown - crown |
| 0G1820B01 | case back gasket |
| WHJ18G | band - leather band |
| WHZ11G | band - leather band |
| 05T27CGM | hand - minute hand |
| 2BH057A1BCA | hand - minute hand |
| 3BA075F1BNG | others - second hand |
| 1BH040A1BAA | others - hour hand |
| 06T03DGM | others - minute hand |
| 06SC11NG | others - second hand |
| 1BA040A1BNG | others - hour hand |
| 2P210450XG14 | others - dial |
| 2P210460XS19 | others - dial |
| 2P215180 | others - case back |
| 2P21518025 | others - case |
| 2P219 | others - machine code |
| 82812070 | others - case ring |
| A120AS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 07SC04NG | others - second hand |
| 2BA060A1BDG | others - minute hand |
Caliber 2P21
