Found on one of two small buckles with London Lions Passant Guardant of the London 1740 -1756 form. Both buckles were originally sold as a pair but although similar are by no means the same. One has a long mark of E Bills see viewtopic.php?t=17740 and the other has it overstamped by the mark below

I think this may be a lost register mark of Samuel Eaton
Samuel Eaton was apprenticed in 1725 to Robert Elliot , a bucklemaker in Gutter Lane . Free of the Leathersellers ( as was Elliot) in 1733. First marks 1736 and 1738, in Gutter Lane. Next marks 1759 to 1767 also at Gutter Lane. Died 1767. See viewtopic.php?f=74&t=23279