Very unusual!! Republic of China 29 year 2 cent copper mistake coin

This is a mistake coin of the Republic of China brass coin provided in 1940 ADVERTISEMENT.

[Size]: about 18.7 mm

[Weight]: about 2.2 g

[Product]: Copper

[Accessory]: None

I believe that there are some mistakes since it is amateur measurement.

Although it is a stunning old coin, I believe that there might be some damage and dirt due to storage in your home, however it is normally in great condition.