Extra Large 10 Yuan Copper Coin with Chinese Yuan Bulk's Head and Made ROC China Third Year of the Republic of China, Gansu（中华民国三年，甘肃）,at the back cast Jiahe ornamentation and currency of ten Yuan（拾圆）. 

Yuan Shikai (1859 - 1916),the currency issued 1914. I don't know it's genuine or modern simulation ,Surely very valuable for collecting.Looks same to me as the Price in China now ￥1688 or more (£168.8 , check Chinese antique sites)

Diameter:8 cm;

Thick 0.4 cm,

Weight :150 grams.(heavy)