20 Mil Réis Thesouro Nacional, 6th print

Brazil's Imperial Treasury relied on Perkins, Bacon & Petch throughout the mid-nineteenth century, and this sixth print of the 20 Mil Réis continues that relationship. Perkins, Bacon's steel-engraving process — developed originally for banknote security in the United States — became the firm's calling card, and their London pressroom supplied paper currency to governments across South America, the British colonies, and beyond.

The "6th print" designation reflects the Thesouro Nacional's practice of issuing notes in successive numbered printings rather than dated series, a cataloguing distinction that matters considerably when tracing emission volumes under Dom Pedro II's reign.