The Seiko 4M21-0010 is a watch model based on the 4M21 movement.
Parts List
| 260P49SN02 | crystal |
| 35E29NV1 | crown - crown |
| 0F260BAA1 | case back gasket - case back gasket |
| 86580710 | crystal gasket |
| 86579370 | bezel gasket |
| 86600130 | bezel gasket - plastic gasket for bezel |
| 80633415 | pusher - button |
| AD006BAA1 | pusher - button gasket |
| D0R4DH | band - band |
| D0R4EH | band - band |
| 10ST08DG | others - second hand |
| 1BF075L1BDG | others - hour hand |
| 2BF105L1BDG | others - minute hand |
| AD006BA11 | others - crown and stem gasket |
| 0351552 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 81606299 | others - bracelet fixing pin |
| 4M210010VQA | others - case |
| 82311055 | others - bezel |
| 82430375 | others - bezel |
| 82837180 | others - case ring |
| 4M210010 | others - case back |
| 4M210010VUA | others - case |
| 4M210010XN14 | others - dial |
| 4M210020XG14 | others - dial |
| 4M211 | others - machine code |
| 83200273 | others - button spring clip |
| 81351630 | others - button spring |
Caliber 4M21
Other models with the same movement
| 4M21-0A10 |
| 4M21-0A20 |
| 4M21-0A30 |
| 4M21-0A40 |
| 4M21-0A50 |
| 4M21-0A60 |
| 4M21-0A70 |
| 4M21-0A80 |
| 4M21-0A90 |
| 4M21-0B00 |
| 4M21-0B0A |
| 4M21-0B10 |
| 4M21-0B20 |
| 4M21-0B30 |
| 4M21-0B40 |
| 4M21-0B50 |
| 4M21-0B60 |
| 4M21-0B70 |
| 4M21-0B80 |
| 4M21-0B90 |
| 4M21-0C00 |
| 4M21-0C10 |