The Seiko 2P21-0B90 is a watch model based on the 2P21 movement.
Parts List
| 185W02SN01 | crystal - crystal |
| 30MA2NA1 | crown - crown |
| 0A1800N01 | case back gasket |
| 86567380 | crystal gasket - plastic gasket for crystal |
| MK61C | band - band |
| MK12D | band - leather band |
| MK60C | band - leather band |
| 07TC2NGM | others - minute hand |
| 07SC02NG | others - second hand |
| 07TB8NGH | others - hour hand |
| A120BS | others - push pin (for lb) |
| 2P210B90P7 | others - case |
| 2P210H40XG19 | others - dial |
| 2P210H40XS19 | others - dial |
| 2P210K80XG14 | others - dial |
| 2P219 | others - machine code |
| 82801760 | others - case ring |
| 0351236 | others - winding stem |
| 2P210B9075 | others - case |
| 2P210B90 | others - case back |
| EZ0035B01 | others - crown and stem gasket |
| 07T08CGM | others - minute hand |
| 07TB8FGH | others - hour hand |
| 07TC2FBM | others - minute hand |
| 08T04A1H | others - hour hand |
Caliber 2P21
