The Seiko 2P21-0A40 is a watch model based on the 2P21 movement.
Parts List
| 205W16HK01 | crystal - crystal |
| 30MC0NB1 | crown - crown |
| 0A1900N01 | case back gasket - case back gasket |
| 86574820 | crystal gasket - plastic gasket for crystal |
| DA34A | band - band |
| 08SC16AG | others - second hand |
| 08T46NGH | others - hour hand |
| 08T46NGM | others - minute hand |
| 82801820 | others - case ring |
| 2P210A4075 | others - case |
| 2P210C50X999 | others - dial |
| 2P219 | others - machine code |
| A120AS | others - push pin |
| 0351236 | others - winding stem |
| EZ0035B01 | others - crown and stem gasket |
Caliber 2P21
