25 Markkaa

Suomen Yhdyspankki was one of Finland's major commercial banks operating under the monetary framework established after Finland adopted the markka as its sole currency in 1877, severing the last formal ties to the Russian ruble system for domestic transactions. Private Finnish banks retained the right to issue notes during this period — a right that would be progressively curtailed as the Bank of Finland consolidated its monopoly over the following decades.

The S-prefix in the Pick reference places this squarely in the unlisted commercial bank category, meaning surviving specimens are tracked through specialist literature rather than mainstream catalogues. Attribution and precise print run data for the 1882 Yhdyspankki series remain incompletely documented.