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<p>[QUOTE=&quot;Conder101, post: 2881733, member: 66&quot;]Until the mid 1820&#039;s all US coins were struck in what is called an &quot;open&quot; collar which was used to relatively center the planchet between the dies but did NOT restrain the expansion of the coin during striking.&nbsp; For that reason the final diameter of the coins all varied slightly depending on the force of the strike and the annealing of the planchet.&nbsp; A soft strike or improperly annealed planchet would result in a smaller diameter, a strong strike or soft well annealed planchet would result in a larger diameter.&nbsp; I find large cents can vary by up to as much as 2 mm in diameter.&nbsp; Starting in the mid 1820&#039;s they started experimenting with close collars that strained the expansion resulting in consistent diameters.&nbsp; After 1836 all coins were struck in close collars.[/QUOTE]</p><p><br /></p>

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