25 Markkaa

Suomen Yhdyspankki was established in 1862 as the first genuinely commercial joint-stock bank in Finland, at a time when the country's monetary system was still working through the transition from the Russian ruble to the newly introduced Finnish markka. This note dates to just two years after the markka was officially established as Finland's unit of account in 1864 — making early issues from private banks like Yhdyspankki part of a genuinely unsettled monetary period, when the Bank of Finland had not yet consolidated note-issuing authority.

Private bank note issuance in Finland was progressively curtailed through the 1880s and effectively ended by 1886. Surviving examples from this 1866 series are scarce for obvious reasons.