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The mark was originally a unit of weight for gold and silver common throughout western Europe, and was equal to 8 troy ounces (249 g). Variations throughout the Middle Ages were, however, considerable.
Later, the weight called "mark" was generally half-a-pound. Like the German systems, also the French poid du marc weight system consider one "marc" equal half-a-pound or 8 ounces.
Like the pound of 12 troy ounces (373 g), the mark was also used as a unit of currency, e.g. in many Shakespearean plays set in medieval England, and in various incarnations in Germany and Finland until the adoption of the euro in 1999.
See also
"Mark (weight)"