100 Mil Réis Thesouro Nacional, 3rd print

Brazil's Thesouro Nacional turned to Perkins, Bacon & Petch at a moment when the firm's siderographic process — steel-plate engraving transferred via a hardened roller — was setting the standard for forgery-resistant currency printing worldwide. The same London house was producing postage stamps for several colonial administrations simultaneously, and Brazilian treasury notes of this period share that characteristic tight, almost mechanical precision in the linework that distinguishes Perkins output from its contemporaries.

The "3rd print" designation reflects successive contracting rounds rather than a redesign — the plate was retained, with differences between printings often subtle enough to require serial number ranges or paper stock analysis to confirm attribution.