The Seiko 5E21-6D90 is a watch model based on the 5E21 movement.
Parts List
| 260A52SR02 | crystal |
| 35M2NNA1 | crown |
| 35M2NNS1 | crown |
| 0F250NA1S | case back gasket |
| LK18G | band - leather band |
| LK19G | band - leather band |
| 3AA125F6ANG | others - hand |
| 0351624 | others - winding stem |
| 1BD080A4BAA | others - hour hand |
| 82812540 | others - case ring |
| 5E215 | others - machine code |
| 5E216D90 | others - case back |
| 5E216D9076 | others - case |
| 5E216D9087 | others - case |
| 5E216E20XS14 | others - dial |
| 5E216E20XS23 | others - dial |
| A170BS | others - push pin |
| 1BD080A4BAD | others - hour hand |
| EZ0035B01 | others - crown and stem gasket |
| 2BD110A0BCA | others - minute hand |
| 2BD110A0BCD | others - minute hand |
| 3AA125F6ANS | others - second hand |