Solid-Ducat: coin from Duchy of Prussia; 1/32 thaler

Illustrated Specimen Details: Prussian Solid-Ducat

Example Specimen: Solid-Ducat, 1658 (Duchy of Prussia)

Authority & Inscriptions: This specimen was issued under Frederick William (Friedrich Wilhelm), Elector of Brandenburg and Duke of Prussia, who ruled Brandenburg-Prussia from 1640 to 1688. The obverse features the stylized crowned monogram 16 FWC 58. The letters "FWC" likely stand for Friedrich Wilhelm Cronprinz or Curfirst (Kurfürst), though interpretations vary across sources. The reverse bears the legend SOLID DUCAT PRUSS, an abbreviation for "Solid of the Duchy of Prussia." A known variety spells the legend with a "V" as "DVCAT PRVSS."

1. DUCHY OF PRUSSIA (BRANDENBURG-PRUSSIA, from 1657 to 1659): solid-ducat = 1/32 thaler

The name "solid-ducat" is a conditional and technically incorrect term widely used in numismatic circles. Despite the name, the coin has absolutely nothing to do with gold ducats. In essence, it is simply a small silver solid.

The Solid-Ducat Misconception: A Tale of Latin Abbreviations

Struck from 1657 to 1659, the so-called "solid-ducat" was a low-denomination silver coin of Brandenburg-Prussia. It was intended for everyday market circulation within the Duchy of Prussia. In Polish numismatic literature, this coin is usually referred to as a szeląg pruski, while Germanic and English-language sources commonly classify it as a schilling.

Origin of the Naming Confusion

The misunderstanding stems directly from the coin's Latin inscription: SOLID DVCAT PRVSS.

To the untrained eye, "DVCAT" appears to denote the famous high-value trade coin. However, the legend is an abbreviation for Solidus Ducatus Prussiae, which translates correctly to "Solid of the Duchy of Prussia." Thus, the word refers to the duchy (ducatus), not the denomination.

Why Collectors Became Confused

The confusion was cemented by a later, visually similar Prussian issue struck from 1669 to 1671. This subsequent coin updated the legend to read SOLID PRUSSIÆ DUCALIS. Because the wording shifted from "DVCAT" to "DUCALIS," many early cataloguers retroactively and incorrectly assumed the earlier 1650s issues were marking a unique "solidus-ducat" denomination.

Historical Context

During the mid-17th century, the monetary system of the Hohenzollern dynasty blended German, Polish, and local Prussian traditions. This convergence created a complex environment of multilingual terminology. Today, the "solid-ducat" serves as a fascinating example of how abbreviated Latin legends and later reinterpretations can create lasting numismatic misconceptions.

Key Point

The solid-ducat was not a ducat, but rather a small silver solidus (or szeląg) of Ducal Prussia, misnamed by collectors due to a misinterpretation of its Latin legend Ducatus (Duchy).