The Seiko 3M21-0A40 is a watch model based on the 3M21 movement.
Parts List
| 250A06SR02 | crystal - crystal |
| 45M98NA1 | crown |
| 0F230NA1S | case back gasket - case back gasket |
| 80604901 | pusher - button |
| D0F1CG | band - band |
| DB04BW | band - band |
| 1AB075A0BNG | others - hour hand |
| 1AC070A1BAA | others - hour hand |
| 2AB100AMBDG | others - minute hand |
| 2AC100A1BCA | others - minute hand |
| 3AA125FMANG | others - second hand |
| 81400709 | others - button spring clip |
| 81350540 | others - button spring |
| 82835760 | others - case ring |
| 0351550 | others - winding stem |
| EG0060B01 | others - button gasket |
| 3M210A40SA | others - case |
| 3M210A40 | others - case back |
| 3M210A40SAA | others - case |
| 3M210A40SAC | others - case |
| 3M210A50XS14 | others - dial |
| 3M210A60XG14 | others - dial |
| 3M211 | others - machine code |
| A170BS | others - push pin |
| 81400829 | others - button spring clip |
| 0Z0060B01 | others - crown and stem gasket |
Other models with the same movement