The Seiko 2P21-0310 is a watch model based on the 2P21 movement.
Parts List
| 165A02JN02 | crystal - crystal (inorganic) |
| 165W11JN01 | crystal |
| 27M19NA1 | crown - crown |
| 0F145BAA7 | case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| HZ43A | band - metal band |
| HZ44A | band - leather band |
| 3BA075F1BNG | others - second hand |
| 07SC17NG | others - second hand |
| 0351236 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 2P21031075 | others - case |
| 2P2103107N | others - case |
| 2P211030XG14 | others - dial |
| 2P211030XS14 | others - dial |
| 2P219 | others - machine code |
| 82813690 | others - case ring |
| 06T03DGM | others - minute hand |
| 07T07DGH | others - hour hand |
| 1BA047A1BNG | others - hour hand |
| 2BA060A1BDG | others - minute hand |
| 2BA067A1BNG | others - minute hand |
Caliber 2P21
