Only the reverse of the 4 zloty 1794 banknote.
A hole behind the facsimile of Malinowski's signature; derivative of a production ink/ink stain.
Low denominations of Insurrection Treasury Bills (up to 4 zlotys) were, in the technological process, combined (glued) from two sheets - obverse and reverse, and then cut to the target size.
The subject of this offering is the reverse alone remaining as a result of ungluing the original denomination of the Treasury Ticket for 4 zlotys.