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<p>[QUOTE=&quot;rickmp, post: 1921888, member: 28047&quot;]There are three dies used to mint a coin. The collar die, which holds the coin within its circle, the anvil die, which imparts the reverse (tails) image on the coin, and the hammer die, which imparts the obverse (heads) image upon the coin. All three come together, with a planchet in between them, at one time, under incredible pressure, producing a coin. The anvil and hammer dies are mounted in the press in such a way as to have every coin come out with the proper heads/tails alignment. Sometimes the dies will become loose causing the dies to move slightly and the heads/tails sides of the coin are not aligned properly, causing what is commonly called a rotation error.[/QUOTE]</p><p><br /></p>

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