The Seiko 2P21-5C50 is a watch model based on the 2P21 movement.
Parts List
| SA9W32JM01 | crystal |
| 30MA2NA1 | crown - crown |
| 0A1600N01 | case back gasket |
| Z5237C | band - metal band |
| Z5237G | band - metal band |
| Z5237G-BK3G | clasp - clasp |
| Z5237C-BK3S | clasp - clasp |
| 04T06DGH | hand - hour hand |
| 04T06DGM | hand - minute hand |
| 07SC02NG | others - second hand |
| EZ0035B0A | others - crown and stem gasket |
| 0351236 | others - winding stem |
| 2P210G50XB14 | others - dial |
| 2P210G50XG14 | others - dial |
| 2P210G50XG24 | others - dial |
| 2P215C50 | others - case back |
| 2P215C5075 | others - case |
| 2P219 | others - machine code |
| 82810440 | others - case ring |
| A100AS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
Caliber 2P21
