Ok. Well George, there are hundreds of arrow marks on metals, both silver metal, antique gold jewelry and flatware, on both sides of the pond. A photo would help a lot. You can upload a photo in a follow-up submission, if you like.
Concerning the word "COIN" after the arrow:
Coin Silver is a silver alloy generally considered 900/1000 pure silver, 100/1000 other metal. The term is applied to flatware and other pieces of silver made in the United States during the 18th and 19th centuries; these pieces were fashioned from actual coins and at other times from silver meeting the standards set by the Mint Act.