The dating you were given is about a millenium off. Your coin dates to c. AD 1200. It is commonly called a
jital and was issued by Hindu Rajput rulers in northern
India at about the time of the Muslim conquest by the Ghorids of Afghanistan. The coin features a sacred
bull on one
side and a mounted horseman on the other. Because the coin is so small, only a
part of each design shows. Similar coins are catalogued by
Robert Tye in
his book
Jitals as
type 33.