4 Soles

Bolivia's 4 Soles denomination existed in an awkward transitional moment — the country had adopted a decimal monetary system on paper, but the old colonial-era fractional silver coinage continued to dominate daily commerce well into the 1850s. These pieces were struck at Potosí, the same mountain mint that had poured out Spanish colonial reales for three centuries, now reluctantly adapting to republican demands.

The three KM varieties reflect assayer changes at Potosí during the run — a common source of variety in Bolivian coinage of this period, where the assayer's initials carried legal accountability for the fineness of the metal.