Sounds like a mark used by the Ellis-Barker Silver Companies located in Birmingham England. In the U.S. they are called Ellis-Barker, in Europe they are refered to as Barker-Ellis.
Founded in the early 1800's. In 1897 they opened an American branch in New York City. According to Rainwater's this mark was used since 1912, however I don't know for how long.
