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<p>[QUOTE=&quot;Numbers, post: 759809, member: 11668&quot;]The BEP&#039;s presses, then as now, use several plates in rotation (so one plate is being inked while another is printing while another is being cleaned off for the next cycle...).&nbsp; During the 1928 and 1934 printings, the BEP used all of its printing plates without regard to signatures and series letters: if they had some new 1934B plates and some old 1934A plates available, then they might very well have put some of each on a single press.&nbsp; Then that press would produce a stack of sheets that keep switching back and forth between 1934A and 1934B.&nbsp; And when those sheets went through the serialling operation, the result would be lots of changeover pairs--and note that half of them would be *reverse* changeovers, with the 1934A note having a higher number than the 1934B note.</p><p>&nbsp;</p><p>In order to get changeovers that skip a series, like your 1934/1934B pair, the BEP would just need to have some old 1934 plates last long enough to end up on the same press with 1934B plates.&nbsp; As it happens, the lifespan of a steel printing plate is pretty long, compared to the rate at which the BEP printed currency in those days, so changeovers like this aren&#039;t terribly uncommon.&nbsp; In the extreme case, you can even find $1 SC changeover pairs that are 1928A/1928E!</p><p>&nbsp;</p><p>Still, those are some pretty neat notes you&#039;ve got.&nbsp; While changeover pairs were printed quite commonly back then, there wasn&#039;t a lot of interest in collecting them at the time (especially not in high denominations like $20&#039;s).&nbsp; So they can be tough to find today, just because it&#039;s fairly tough to find *any* long run of consecutive notes from the 1928 or 1934 series....[/QUOTE]</p><p><br /></p>

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