25 Drachmai

The National Bank of Greece was established by royal decree in 1841, the same year this note was authorized — making this among the earliest issues of the institution itself. Greece had only formally gained independence in 1830 after nearly four centuries of Ottoman rule, and the country's monetary infrastructure was still being assembled from scratch. The Bank's early charter gave it the exclusive right of note issue, a privilege it would hold, contested and renegotiated, for decades.

Pick 15 is exceptionally rare. The embossed seal was the sole mechanical security feature, reflecting both the printing technology available and the limited circulation network the Bank could realistically support in 1841.