The Seiko 2P21-0A10 is a watch model based on the 2P21 movement.
Parts List
| ESFN34JM01 | crystal |
| ESFN34JM02 | crystal |
| 30M98NA1 | crown |
| 0H1860N01 | case back gasket - case back gasket |
| B5337C | band - metal band |
| B5337G | band - metal band |
| B5337G-BK5G | clasp - clasp |
| B5337C-BK5S | clasp - clasp |
| 07SC02NG | others - second hand |
| 0351236 | others - winding stem |
| 2P210A10 | others - case back |
| 2P210A1025 | others - case |
| 2P210A10EA | others - case |
| 2P210B00XA15 | others - dial |
| 2P210B00XA25 | others - dial |
| 2P219 | others - machine code |
| 82800420 | others - case ring |
| A120AS | others - push pin |
| DZ0041B01 | others - crown and stem gasket |
| 2BE055L0BDG | others - minute hand |
| 05T18DGM | others - minute hand |
| 1BE035L0BDG | others - hour hand |
| 05T18DGH | others - hour hand |
Caliber 2P21
