The Seiko 3M21-0A30 is a watch model based on the 3M21 movement.
Parts List
| 200A52SR02 | crystal - crystal |
| 45M98NA1 | crown |
| 0F230NA1S | case back gasket - case back gasket |
| 80604881 | pusher - button |
| D0F2CG | band - band |
| DB05BW | band - band |
| 3AA125FMANG | others - second hand |
| 1AB055A0BNG | others - hour hand |
| 1AC055A0BAA | others - hour hand |
| 2AB080A0BDG | others - minute hand |
| 2AC080A0BCA | others - minute hand |
| A120BS | others - push pin (for lb) |
| 3M210A30XS14 | others - dial |
| 3M210A40XG14 | others - dial |
| 3M211 | others - machine code |
| 82835760 | others - case ring |
| 81350540 | others - button spring |
| 0351550 | others - winding stem |
| EG0060B01 | others - button gasket |
| 81400709 | others - button spring clip |
| 3M210A30SA | others - case |
| 3M210A30 | others - case back |
| 3M210A30SAA | others - case |
| 3M210A30SAC | others - case |
| 0Z0060B01 | others - crown and stem gasket |
| 81400829 | others - button spring clip |
Other models with the same movement