 The New Canton site was also excavated in 1867 (discovering kiln wasters which were tested by a chemist at the direction of Lady Charlotte Schreiber) whilst another dig occurred in 1921 on the opposite side of the High Street.No consistent factory marks were used at Bow, but there are a confusing number of marks that appear on some pieces or at some period, especially an anchor and dagger in the 1760s.Various suggestions have been made as to the meaning of other marks and letters that sometimes appear, with attempts to relate them to the names of possible modellers and other theories.