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<p>[QUOTE="cladking, post: 890889, member: 68"]The dies often got filled with a little debris and this was especially a problem on small parts that were angular like the mint mark. It wasn't considered much of a problem in the late-'70's because there was almost no collecting of these coins and no one complained about the abysmal quality. Additionally they didn't use any mintmarks at all on circulating quarters until 1980 except for Denver so if there was a blob you knew it was a "D". This became much more noticeable in 1980 when they started using a "P" blob as well. So they started increasing the size of the mint marks until in 1984 they simply threw in the towel and made them huge. These were less prone to filling and easy enough to read even when they filled. </p><p><br /></p><p>The clads have undergone a relatively steady improvement in quality since 1965 even as the relief (the depth of the design) has been steadily lowered. </p><p><br /></p><p>For some dates this filling of the mint mark is actually typical. The worst is the 1980-P.[/QUOTE]</p><p><br /></p>
[QUOTE="cladking, post: 890889, member: 68"]The dies often got filled with a little debris and this was especially a problem on small parts that were angular like the mint mark. It wasn't considered much of a problem in the late-'70's because there was almost no collecting of these coins and no one complained about the abysmal quality. Additionally they didn't use any mintmarks at all on circulating quarters until 1980 except for Denver so if there was a blob you knew it was a "D". This became much more noticeable in 1980 when they started using a "P" blob as well. So they started increasing the size of the mint marks until in 1984 they simply threw in the towel and made them huge. These were less prone to filling and easy enough to read even when they filled. The clads have undergone a relatively steady improvement in quality since 1965 even as the relief (the depth of the design) has been steadily lowered. For some dates this filling of the mint mark is actually typical. The worst is the 1980-P.[/QUOTE]
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