The Seiko 2P21-5170 is a watch model based on the 2P21 movement.
Parts List
| SAGN09JM | crystal |
| SAGN09JM01 | crystal |
| 30N63NA1 | crown - crown |
| 30ND3NA1 | crown - crown |
| 0G1700B0 | case back gasket |
| 0G1700B01 | case back gasket |
| 0G1750B0 | case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| 0G1750B01 | case back gasket |
| M5044S | band - metal band |
| 05T05DAH | hand - hour hand |
| 05T05DCH | hand - hour hand |
| 05T11DGM | hand - minute hand |
| 3BA075F1BNG | others - second hand |
| 06SC15NG | others - second hand |
| 82811210 | others - case ring |
| A100AS | others - push pin |
| 2P210440XN14 | others - dial |
| 2P215170 | others - case back |
| 2P21517029 | others - case |
| 2P219 | others - machine code |
Caliber 2P21
