Scope
This technical guide summarises the Miyota 8215 automatic movement details shown in WRT product data and the main compatibility checks to make before using it for a replacement, repair, or custom build.
Specification Reference
| Movement type |
Automatic mechanical movement with hand winding listed in product data |
| Size listed |
11 1/2 ligne |
| Height listed |
5.67 mm |
| Jewels listed |
21 |
| Vibration frequency listed |
21,600 per hour |
| Running time listed |
Approximately 42 hours |
| Accuracy listed |
-20 to +40 seconds per day |
| Display listed |
3 hands with date |
| SKU listed |
MIY8215 |
Compatibility Checks
- Case fit: confirm movement diameter, total height, stem position, and movement holder requirements.
- Date position: confirm the date window position on the dial matches the movement and date wheel layout.
- Hand fit: confirm hour, minute and seconds hand hole sizes before selecting hands.
- Dial fit: confirm dial feet position, dial diameter, and whether dial dots or feet modification are required.
- Stem and crown: confirm stem type and crown fit for the case being used.
- Rotor clearance: confirm the case back and movement holder allow enough clearance for the automatic rotor.
Replacement Planning
| Check |
Why It Matters |
| Existing calibre marking |
Confirms whether the watch currently uses a Miyota 8215 or a related movement. |
| Movement holder |
The holder controls case fit and alignment, not just the movement itself. |
| Dial and hands |
A movement can be correct while the dial or hands still do not fit. |
| Date alignment |
Date windows can make an otherwise close movement swap unsuitable. |
| Case thickness |
Automatic movements require rotor clearance under the case back. |
Documentation Links
Related WRT Pages
