ASSAY MARK - The stamp by an assayer on a bar or piece of precious metal to guarantee its fineness.
ASSAY MARKS
The next introduction, in 1423, was the addition of the assay mark, which showed that the piece had been checked for quality by an assay office. Various offices were set up throughout the country and each office had its own mark.
assay mark
The official mark or series of marks on a piece of jewellery that identifies the purity or fineness of the alloy used in it as well as its maker or designer. Also known as a hallmark ...
According to the LBMA Good Delivery Rules, all bars must have marks that include, the stamp of the refiner, the assay mark, the fineness, the serial number and the year of manufacture.
The assay mark of Birmingham, England is an anchor which is not very logical as Birmingham does not have a port, nor is it located near a sea or other open water.
 See also: Stamp, Assay, Antique, Precious metal, Precious
  
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