The Seiko 2P21-5370 is a watch model based on the 2P21 movement.
Parts List
| K00W61JR01 | crystal - crystal (inorganic) |
| 30M57NA1 | crown - crown |
| 0F145BAA7 | case back gasket |
| 0F150BAA1 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| ZA12A | band - band |
| 06T03DGH | others - hour hand |
| 3BA075F1BNG | others - second hand |
| 06SC11NG | others - second hand |
| 1BA040A1BNG | others - hour hand |
| 0351236 | others - winding stem |
| 06T03DGM | others - minute hand |
| 81606439 | others - bracelet fixing pin |
| 81181459 | others - bracelet fixing pipe |
| 81606679 | others - bracelet fixing pin |
| 2P2153707NY | others - case |
| 82823190 | others - case ring |
| 2P210920XS14 | others - dial |
| 2P215370 | others - case back |
| 2P2153707N | others - case |
| 2P219 | others - machine code |
| 2BA060A1BNG | others - minute hand |
| 2BA060A1BDG | others - minute hand |
Caliber 2P21
