40 Réis - Maria I (Large Type; Low and High Crowns; Lisbon)

The 40 Réis coin minted during the reign of Maria I of Portugal reflects the colonial economic structure of the late 18th century. Struck in Lisbon for use in the State of Brazil, these copper pieces were essential for daily commerce, facilitating small-value transactions in an economy heavily reliant on agricultural exports and precious metal extraction. The transition toward the 'Large Type' design during her reign signaled a standardization effort within the Portuguese monetary system to accommodate the growing needs of the transatlantic trade network.

The design features the crowned shield of Portugal on the obverse and the denomination within a wreath on the reverse. Variations in crown height, categorized by numismatists as 'Low' or 'High' crown styles, resulted from manual die-sinking processes of the period. While intended purely as functional currency, these coins are now appreciated for their historical role as a primary medium of exchange in colonial Brazil before the establishment of a formal local minting infrastructure.