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<p>[QUOTE=&quot;funkee, post: 1903599, member: 37925&quot;]A key note or key series is pretty loosely defined. It is the hardest to find note/type/block of a set. Depending on the set, the key series may be the same or it may be different. It depends on how the collector builds the set.</p><p><br /></p><p>The key series to a $1 silver certificate type set may be the 1928-E. But if the collector considers stars, mules, experimental notes and blocks, there are harder to find notes. </p><p><br /></p><p>I think a general answer is appropriate: the key note (or key series) is the scarcest note for any given set.</p><p><br /></p><p>It&#039;s hard to gauge scarcity by production numbers, however. Lowest production doesn&#039;t necessarily mean rarity. It also depends on the amount of notes physically released into circulation, redemption rates, and other socio-economic conditions that affected the survival.[/QUOTE]</p><p><br /></p>

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