Touchstone formerly used at the Royal Mint
Touchstone formerly used at the Royal Mint for the assay of gold.
Touchstone formerly used at the Royal Mint for the assay of gold
Touchstone formerly used at the Royal Mint for the assay of gold.
Two star shaped objects, each with a hole in the centre and various circular samples on each point of the star, each marked with a number, associated with touchstone formerly used at the Royal Mint for the assay of gold.