MIYOTA 6T28
General Specifications
| Specification | Value |
|---|---|
| Size (Dimensions) | 8 3/4" |
| Thickness | 5.23 mm |
| Accuracy | -20 ~ +40 seconds/day |
| Beat Error | (Less than) 50 seconds |
| Power Reserve | (Approx.) 40 hours |
| Frequency | (Vibrations) 28800 / hour |
Movement Details
Clearance
The clearance between the hands and the dial/case varies depending on the glass, hand length, and case structure. The minimum clearance between hands and dial/case is 0.40mm or more.
Movement Structure Diagram Description
A diagram illustrates the movement's internal structure, showing components like the mainspring. The mainspring dimensions are noted as 0.35 ~ 0.45mm.
Technical Data
| Specification | Value |
|---|---|
| Jewels | 21 |
| Lift Angle | 50 degrees |
| Minimum Package Quantity | 300 pieces |
Measurement Conditions & Winding
Accuracy Measurement
Accuracy is measured within 10-60 minutes after fully winding the mainspring in position ① (Dial Up).
Beat Error Measurement
Beat error is measured in 4 positions within 10-60 minutes after fully winding the mainspring. The positions are:
- ① Dial Up (表面向上)
- ② 6 o'clock Up (6点位向上)
- ③ 9 o'clock Up (9点位向上)
- ④ 3 o'clock Up (3点位向上)
Power Reserve
| Model | Winding Turns |
|---|---|
| 90 / 91 | 40 turns of crown stem |
| 82 / 8N | 40 turns of crown stem |
| 6T | 20 turns of crown stem |
Winding Structure Diagram Description
Diagrams illustrate the winding mechanism for different model series:
- For models 90/91/6T: [Description of winding mechanism diagram]
- For models 82/8N: [Description of winding mechanism diagram]
Optional Accessories
The following accessories can also be ordered:
- Movement holder gasket: Part number 082-070
- Screw: Part number 923-140
Other related components mentioned include Crown stem (065-117, 928-150), Ratchet spring (078-040), and Ratchet wheel (075-378).
Visual Representation
An illustration shows a watch face with the "6T28" model designation. A separate graphic depicts a hand adjusting the time using the crown. The movement diameter is indicated as φ19.80. A note states that a gold-plated version is available (可提供金色版).
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