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<p>[QUOTE=&quot;Bardolph, post: 4585723, member: 96174&quot;]The &quot;marco castellano&quot; was the standard weight for gold and silver, equivalent to 230 grams.&nbsp; A mint or casa de moneda would be supplied with x number of marcos and in the case of silver had to produce 67 reales.</p><p><br /></p><p>For gold, between 1535 and 1771, a mint had to produce 68 escudos in 1, 2. 4 or 8 escudos of 22 carat gold.</p><p><br /></p><p>The half escudo, from 1742 to 1786 was minted with 21 carat gold and weighed 1.762 gms. There were 130.56 half escudos to the marco.From 1786 onwards the gold in the half escudo was lowered to 20 carats</p><p><br /></p><p>Weights were always very strictly controlled and mints were only permitted a tolerance equivalent to 0.899 gms of silver and 0.29 gms of gold per marco[/QUOTE]</p><p><br /></p>

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