PT – flat tip , bent shank hallmark lettering is 0.75mm high
PD – flat tip , bent shank hallmark lettering is 1.0mm high
A hallmark is a mark or series of marks struck on items made of precious metals ( like platinum ,palladium , gold, or silver ), manufacturer & or country. Hallmarks should guarantee a certain purity or fineness of the metal. NB! Hallmarking systems differ from country to country.