10 Ducats - Ferdinand III Vienna

Ferdinand III inherited the Thirty Years' War from his father and spent the better part of his reign negotiating its end — the Peace of Westphalia in 1648 fundamentally dismantled Habsburg dominance over the German states and cost the dynasty enormous political capital. Multiple die pairings across these years account for the Heraeus reference spread; these were presentation pieces, struck for diplomatic gifts and court ceremony rather than commerce, which explains why survivors tend to appear in grades inconsistent with their age.

The Vienna mint's ten-ducat format was among the heaviest gold multiples struck in Central Europe at the time. Several die marriages listed under the Heraeus numbers show measurable variation in the portrait punch, suggesting the mint cycled through engravers during the war years.