150 Réis - José I (Straight Zones; Province of Minas Gerais; Rio de Janeiro)

The 150 Réis of 1771 was minted during the reign of King José I of Portugal, a period defined by the colonial administration of Brazil and the heavy reliance on extraction from the gold-rich Minas Gerais region. This specific denomination formed part of the monetary system designed to facilitate internal trade within the colony and maintain fiscal control for the Portuguese crown. These coins were produced in the Rio de Janeiro mint, reflecting the colonial bureaucracy's efforts to standardize currency across the diverse territories of the Portuguese Empire.

The design of this series is characterized by the 'straight zones' style, an aesthetic approach that prioritizes geometric clarity in the heraldic and denominational markings. While the designs were largely mandated by royal decree to ensure uniformity across the realm, they reflect the broader neoclassical sensibilities prevalent in 18th-century European numismatics. The coins were received as standard tender by merchants and colonial officials alike, serving as a functional tool of the mercantilist economy rather than a purely artistic statement.