6⅔ Riksdaler Banco / 10 Riksdaler Riksgäld

The fractional face value — 6⅔ Riksdaler Banco — exists because of the fixed conversion rate between Sweden's two parallel currencies: one Riksdaler Banco equaled exactly 1½ Riksdaler Riksgäld, making 6⅔ Banco precisely equal to 10 Riksgäld. Both values were printed on the same note to satisfy a public that dealt in either unit depending on context. The dual-denomination format wasn't a design choice; it was a legal necessity imposed by the coexistence of two distinct monetary systems that Sweden refused to unify until 1855.

Sveriges Rikes Ständers Bank — the precursor to the Riksbank — was itself a parliamentary institution, owned by the Estates rather than the Crown, which made it structurally unlike nearly any other central bank in Europe at the time.