1. 无直角断层:齿壁向下走到槽底,缓慢圆弧拐弯连到币侧面,看不到90度锋利拐角;
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2. 过渡一体连贯:齿壁斜度、齿根圆弧、币外缘圆弧是一条连续顺滑曲线,金属纹理全程连通;
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3. 根部有微量留银颗粒:高压挤压金属堆积,齿根圆弧凹陷处天然留存细碎流银小点,是挤压痕迹,不是后期划痕。
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