The Seiko 2P21-5310 is a watch model based on the 2P21 movement.
Parts List
| K00W61JK01 | crystal |
| 30M57NA1 | crown - crown |
| 30M57NS1 | crown - crown |
| 0F145BAA7 | case back gasket |
| 0F150BAA1 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| ZA11A | band - metal band |
| ZA13A | band - metal band |
| 2BC060A1BNG | others - minute hand |
| 1BC042A1BNG | others - hour hand |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 06SC11NG | others - second hand |
| 0351236 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81181459 | others - bracelet fixing pipe |
| 82823190 | others - case ring |
| 2P210910XS19 | others - dial |
| 2P210910XS29 | others - dial |
| 2P215310 | others - case back |
| 2P21531075 | others - case |
| 2P2153107E | others - case |
| 2P219 | others - machine code |
| 06SC11NS | others - second hand |
| 06T17ASH | others - hour hand |
| 06T17ASM | others - minute hand |
| 06T17NGM | others - minute hand |
| 06T17NGH | others - hour hand |
Caliber 2P21
