This is a feng shui (good luck) token made of brass and silver plated to look old. It is a modern novelty gift item, often sold to tourists. It is an attractive piece, but not at all valuable.
The figure on the front of the token is Sun Zhongshan, or Sun Yat-sen, or Sun Wen, Chinese physician, writer, philosopher, calligrapher and revolutionary, the first president and founding father of the Republic of China.
As a modern novelty item, collectors usually buy these for a few US dollars. A coin dealer would probably offer less than $1 to buy one from you.