During the investigation process last night, Liu Qingshan not only compared the photos of buttons on the Internet.


    I even asked some experts who have a hobby of collecting in this area for advice.


    "This button is rather special."


    It is the picture of this button on the projection.


    "This black background is inlaid with gold-trimmed buttons, and the material is very special."


    "First of all, the gold edge of this button is gilded."


    "The black bottom is also


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