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<p>[QUOTE=&quot;Conder101, post: 2868735, member: 66&quot;]I haven&#039;t found where they started expressing diameters in mm but I have found where weights were expressed in grams in the coinage Act of 1873 with the half dollar being set at &quot;12 and 1/2 grams with the quarters and dimes being in proportion.&quot;</p><p><br /></p><p>The government authorized the use of the metric system throughout the country in 1866&nbsp; (Metric act of 1866 (Public Law 39-183))&nbsp; This authorized its use but didn&#039;t make its use mandatory (mistake).[/QUOTE]</p><p><br /></p>

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