500 Zlotych

Bank Polski's 500 Złotych of 1919 was issued during an extraordinary window — Poland had just re-emerged as a sovereign state after 123 years of partition, and the new government desperately needed a functioning currency before any stable monetary infrastructure existed. Waterlow & Sons in London produced the notes because there was no domestic printing capacity capable of handling the job.

The Polish mark was already in circulation alongside this zloty-denominated paper, creating genuine confusion in daily commerce. The watermark security feature was among the few practical counterfeit deterrents available under the rushed production timeline.