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<p>[QUOTE=&quot;clayirving, post: 8437583, member: 18867&quot;]FYI.</p><p><br /></p><p>The first major experimental group of small notes was printed in November 1932 and delivered to the Treasury for release into circulation in January and February of 1933, during the period of the $1 Series 1928 A and 1928 B. The experimental set was to determine the effect of changing the relative amounts of linen and cotton paper fibers. The XB and YB blocks were each printed on paper of different proportions of rag content with the ZB block as the control. </p><ul> <li>The XB block, consisting of serial numbers X00000001B through X10728000B, was made up of 50% linen and 50% cotton. These serial numbers are well above the ranges used on any other notes from the 1928 A and B Series.</li> </ul><p> <ul> <li>The YB block, consisting of serial number Y00000001B through Y10248000B, was made up of 75% linen and 25% cotton. These serial numbers are well above the ranges used on any other notes from the 1928 A and B Series.</li> </ul><p> <ul> <li>The ZB block, consisting of serial numbers Z00000001B through Z10248000B, was the control. These serial numbers are well above the ranges used on any other notes from the 1928 A and B Series.<br /> .<br /> <br /> </li> </ul><p>[/QUOTE]</p><p><br /></p>

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