The Seiko 2P21-521A is a watch model based on the 2P21 movement.
Parts List
| ESDW03SN01 | crystal - crystal (sapphire) |
| 30M57NA1 | crown - crown |
| 0F165BAA5 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| DL03B | band - band |
| 3BA075F1BNG | others - second hand |
| 1BA042A1BNG | others - hour hand |
| 2BA065A1BNG | others - minute hand |
| 07SC25NG | others - second hand |
| 06T05NGM | others - minute hand |
| 06T05NGH | others - hour hand |
| 2P21521A75 | others - case |
| 82820010 | others - case ring |
| 2P21521A | others - case back |
| 2P210660XG14 | others - dial |
| 2P219 | others - machine code |
| A140AS | others - push pin |
| ESDW03SN01 | crystal - crystal (sapphire) |
| 30M57NA1 | crown - crown |
| 0F165BAA5 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| DL03B | band - band |
| 3BA075F1BNG | others - second hand |
| 1BA042A1BNG | others - hour hand |
| 2BA065A1BNG | others - minute hand |
| 07SC25NG | others - second hand |
| 06T05NGM | others - minute hand |
| 06T05NGH | others - hour hand |
| 2P21521A75 | others - case |
| 82820010 | others - case ring |
| 2P21521A | others - case back |
| 2P210660XG14 | others - dial |
| 2P219 | others - machine code |
| A140AS | others - push pin |
Caliber 2P21
