20 Zlotys

Bank Polski's 1926 series was printed by the American Bank Note Company in New York — an unusual choice for a newly reconstituted Polish central bank, but one driven by capacity constraints at European printers in the post-WWI reconstruction period. Poland had only reestablished its own currency infrastructure a few years prior, following the brutal hyperinflation of the early 1920s that had destroyed the Polish marka and necessitated the zloty reform of 1924.

The ABNC's involvement left a visible trace: the engraving quality is notably finer than contemporary European-produced Polish issues, and the paper stock differs accordingly. Collectors should note that the series is prone to foxing along the margins due to the interaction of the American paper with central European storage conditions.