The Seiko 2P21-5B50 is a watch model based on the 2P21 movement.
Parts List
| RE1W10JK01 | crystal - crystal |
| 30MC0NB1 | crown - crown |
| 30MC0NS1 | crown - crown |
| 0A1900N01 | case back gasket - case back gasket |
| 86574780 | crystal gasket - plastic gasket for crystal |
| HE04A | band - band |
| HE05A | band - band |
| 05T28DGM | others - minute hand |
| 05T28DSH | others - hour hand |
| 05T28DSM | others - minute hand |
| 05T30DGH | others - hour hand |
| 07SC02NG | others - second hand |
| 07SC02NS | others - second hand |
| 0351236 | others - winding stem |
| 2P215B5075 | others - case |
| 82802040 | others - case ring |
| 2P215B507E | others - case |
| 2P210C80XS19 | others - dial |
| 2P210C90X994 | others - dial |
| 2P219 | others - machine code |
| A130BS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
Caliber 2P21
