How to tell the authenticity of 20 10 China calligraphy commemorative coins

Hello. The "Harmony" commemorative coins issued on 20 10 are the second group of "Harmony" commemorative coins. The front of this ordinary commemorative coin is the national emblem, with the name of "People's Republic of China (PRC)" printed on the top and the denomination of "Yiyuan" and the year number of "20 10" printed on the bottom. The main scene pattern on the back is the word "He" in official script, and the word "He" written in various fonts is on the top, and the background is set off by calligraphy. Please look at the steganography in the picture below. The Bilan team really answers for you!