Its a commonly used term (used in the UK) to denote a coin which has been hammered between two dies to punch the design into metal. Hammered coins in the UK range from the early Medieval period until the mid-17th century. Although coins have been hammered since early BC. After hammered, you get the milled coins, produced in mills with horse power at first & then steam in the late 1790s.young one said:whats a hammered?