| The Liao dynasty (Ch'i-tan, Tartar)
Emperor T'ien Cha (1101-25)
year title T'ien Ch'ing 
Traces of thin golden layer on the surface
Shown item may be imitation
There are references on two such rarest coins in the Chinese book Illustrative plates of Chinese ancient coins - both with the same sizes but one with golden surface.
In the book 'Zhong Guo Hua Qian' - 'Chinese charms' ( Yu Liu Liang etc., Shanghai, 1992, page 262, coin No.1261) this coin is shown as charm with coin legend -also rarest!