Plappart Gothic lettering, with rays

Basel's civic coinage of the early sixteenth century was produced under the direct authority of the city council, which had effectively wrested monetary control from the bishop by the late fifteenth century. The Plappart was a workhorse denomination in the Upper Rhine currency system, circulating alongside comparable issues from Bern, Zürich, and the Habsburgs in a region where no single monetary authority dominated.

The HMZ 2#66a attribution places this squarely in the period just before Basel formally joined the Swiss Confederation in 1501 reshaped the city's political alliances — and in the years running up to the Reformation of 1529, which triggered a complete overhaul of civic institutions, including the mint.