4 Soles

Bolivia's fractional silver coinage of the early 1850s was struck under considerable pressure from mining interests in Potosí, where the famous Cerro Rico mines were still producing significant silver output but the newly independent republic was struggling to maintain consistent fineness standards. The .667 fineness of this issue reflects a deliberate reduction from earlier colonial-era standards, part of a broader regional trend of debasing fractional denominations while preserving higher silver content in the larger macukina and peso-sized pieces.

Potosí mint output during these years was erratic, with documented interruptions in 1854 tied to regional political instability following the fall of Manuel Isidoro Belzu's first period of consolidated power.