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<p>[QUOTE=&quot;JBK, post: 151931, member: 1101&quot;]I can only guess that there are different chemicals added to prevent mildew (which I know they do now), etc., or used in the binder substance, or maybe the paper is prepared differently - since the 50s they use the dry process (vs wet printing).</p><p><br /></p><p>I am sure the make up of the paper (cotton fiber) is the same, but there have been changes for sure.&nbsp; One case is the threads - I have a Series 1917 $1 with a bucket of blue and red fibers running down one part of the bill.[/QUOTE]</p><p><br /></p>

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