The Seiko 2P21-0180 is a watch model based on the 2P21 movement.
Parts List
| 170W11HN01 | crystal |
| 170P01HN03 | crystal |
| 30M57NA1 | crown - crown |
| 0F150BAA5 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| 86581110 | crystal gasket |
| DB32A | band - metal band |
| DB33A | band - metal band |
| 3BA075F1BNG | others - second hand |
| 07SC43NG | others - second hand |
| 0351236 | others - winding stem |
| 81181839 | others - bracelet fixing pipe |
| 81611339 | others - bracelet fixing pin |
| 2P21018075 | others - case |
| 2P210180SA | others - case |
| 2P210580XG14 | others - dial |
| 2P210580XS14 | others - dial |
| 2P219 | others - machine code |
| 82820070 | others - case ring |
| 07T31DGH | others - hour hand |
| 07T31DGM | others - minute hand |
| 1BD050LDBDG | others - hour hand |
| 2BD072LABDG | others - minute hand |
Caliber 2P21
