10 Mil Réis Thesouro Nacional, 4th print

Perkins, Bacon & Petch produced this note during a transitional moment in the firm's own history — the "Petch" designation places it between the earlier Perkins, Bacon & Petch partnership and the later Perkins, Bacon & Co. consolidation, a window that closed around 1858. The 4th print designation distinguishes this from earlier impressions of the same plate series, though the distinctions between print runs are subtle enough that attribution depends largely on paper stock and impression characteristics rather than obvious visual differences.

Brazil's Imperial Treasury issued paper currency in a monetary environment still dominated by distrust of fiduciary instruments — the 1850s saw repeated debates in the Chamber of Deputies over whether note issuance should remain with the Treasury or be ceded entirely to commercial banks.