The Seiko 2P21-5B90 is a watch model based on the 2P21 movement.
Parts List
| ES9W32JM01 | crystal |
| 30MA2NA1 | crown - crown |
| 0A1800N01 | case back gasket |
| 86580360 | crystal gasket - plastic gasket for crystal |
| Z5212C | band - metal band |
| Z5212C-BK5S | clasp - clasp |
| 07SC02NG | others - second hand |
| 05T20DGH | others - hour hand |
| 05T20DGM | others - minute hand |
| 2P210E20X994 | others - dial |
| 2P215B90 | others - case back |
| 2P215B907E | others - case |
| 2P219 | others - machine code |
| 82803600 | others - case ring |
| 0351236 | others - winding stem |
| A120AS | others - push pin |
| EZ0035B0A | others - crown and stem gasket |
| EZ0035B01 | others - crown and stem gasket |
Caliber 2P21
