The Seiko 5E21-5B50 is a watch model based on the 5E21 movement.
Parts List
| SA0P04SN02 | crystal - crystal |
| 35M0SNA1 | crown - crown |
| 0F260NA1S | case back gasket - case back gasket |
| 86582420 | crystal gasket - plastic gasket for crystal |
| DAP6BW | band - band |
| 3BA125F1BNG | others - second hand |
| 1BB060A0BAC | others - hour hand |
| 1BH060A0BAA | others - hour hand |
| 2BB090A0BCC | others - minute hand |
| 0351624 | others - winding stem |
| 5E215B5075 | others - case |
| 82833680 | others - case ring |
| 5E215B50 | others - case back |
| 5E215 | others - machine code |
| 5E215B50XG14 | others - dial |
| 5E215B60XS14 | others - dial |
| 87020283 | others - back plate |
| A170BS | others - push pin |
| EA0040B0A | others - crown and stem gasket |
| 2BH090A0BAA | others - minute hand |