The Seiko 2P21-0B50 is a watch model based on the 2P21 movement.
Parts List
| 190W14GN00 | crystal - crystal |
| 30MA2NA1 | crown - crown |
| 30MA2NS1 | crown - crown |
| 0A1800N01 | case back gasket |
| 86570340 | crystal gasket |
| HK35B | band - band |
| HK34B | band - band |
| HK32B | band - leather band |
| HK33B | band - leather band |
| HK44B | band - leather band |
| 08SC14NG | others - second hand |
| 0351236 | others - winding stem |
| 2P210B507E | others - case |
| 2P210G00XG19 | others - dial |
| 2P210G00XS19 | others - dial |
| 2P210G00XS29 | others - dial |
| 2P210G10XS19 | others - dial |
| 2P210J40XS19 | others - dial |
| 2P210J50XS19 | others - dial |
| 2P219 | others - machine code |
| A110AS | others - push pin |
| 82801760 | others - case ring |
| 2P210B5075 | others - case |
| 2P210B50 | others - case back |
| EZ0035B01 | others - crown and stem gasket |
| 08SC14NS | others - second hand |
| 07TC2FGH | others - hour hand |
| 07TC2FGM | others - minute hand |
| 07TC2FSH | others - hour hand |
| 07TC2FSM | others - minute hand |
| 190W14GN00 | crystal - crystal |
| 30MA2NA1 | crown - crown |
| 30MA2NS1 | crown - crown |
| 0A1800N01 | case back gasket |
| 86570340 | crystal gasket |
| HK35B | band - band |
| HK34B | band - band |
| HK32B | band - leather band |
| HK33B | band - leather band |
| HK44B | band - leather band |
| 08SC14NG | others - second hand |
| 0351236 | others - winding stem |
| 2P210B507E | others - case |
| 2P210G00XG19 | others - dial |
| 2P210G00XS19 | others - dial |
| 2P210G00XS29 | others - dial |
| 2P210G10XS19 | others - dial |
| 2P210J40XS19 | others - dial |
| 2P210J50XS19 | others - dial |
| 2P219 | others - machine code |
| A110AS | others - push pin |
| 82801760 | others - case ring |
| 2P210B5075 | others - case |
| 2P210B50 | others - case back |
| EZ0035B01 | others - crown and stem gasket |
| 08SC14NS | others - second hand |
| 07TC2FGH | others - hour hand |
| 07TC2FGM | others - minute hand |
| 07TC2FSH | others - hour hand |
| 07TC2FSM | others - minute hand |
Caliber 2P21
