The Seiko 5E21-6E90 is a watch model based on the 5E21 movement.
Parts List
| 260A08SR02 | crystal - crystal |
| 30M82NB1 | crown - crown |
| 0F240NA1S | case back gasket - case back gasket |
| 4919CZ-LK4 | band - link |
| 4919CZ | band - band |
| D0T0AZ | band - band |
| D0T0CZ | band - band |
| D0T0AZ-LK00 | band - link |
| D0T0CZ-LK00 | band - link |
| D0T0CZ-LK4 | band - link |
| D0T0CZ-BKF | clasp - clasp |
| 4919CZ-BKF | clasp - buckle |
| 1BB080A1BNG | others - hour hand |
| 2BB110A1BNG | others - minute hand |
| 3AA125F6ANG | others - hand |
| 0351624 | others - winding stem |
| 5E215 | others - machine code |
| 5E216G10XL14 | others - dial |
| 5E216G10XS14 | others - dial |
| 5E216G70XS14 | others - dial |
| 87020283 | others - back plate |
| 81604259 | others - bracelet fixing pin |
| 81190155 | others - bracelet fixing pipe |
| 82814640 | others - case ring |
| 5E216E90ME | others - case |
| 5E216E90 | others - case back |
| 5E216E90RL | others - case |
| EZ0035B01 | others - crown and stem gasket |