General DescriptionTechnical features
- Diameter (in millimeters): Ring: 26.9
- Weight (in grams): 9
- Thikness (in millimeters): 2
- Form : Round
- Color :
- Composition :
- Core: Co 15%- Ni 25%,
- Ring: Cu 70% - Zn 24,5%- Ni5,5%
- Edge : Finely-ridged sections interspersed with smooth sections
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