NOTE: In 1797 (in the occasion of doubling of the duty to be paid on silver), the duty mark was impressed twice. The hall-marks cycle beginning in 1875 (it terminates in 1899) the anchor is laying down. In 1973, to commemorate the bi-centenary of the Assay Office opened in 1973, the town mark appears with two capital letters "C", one on the right and the other on the left of the anchor. this means two hundreds in Roman numbers (see the mark - maker Mappin & Webb).