Austrian 1521 Guldengroschen

The 1521 Austrian Guldengroschen was among the first coins to standardize a high silver content, weighing around 27.6 grams at 93.3% purity, which helped unify currency across the Habsburg domains.

That purity wasn't just for show; it reflected Ferdinand I's push to combat debased coins flooding Europe, drawing from silver mined in the Tyrolean Alps. The obverse typically bore the emperor's bust, while the reverse showed the imperial eagle, symbols that echoed the era's power struggles.

Mintage figures for this specific year are murky, lost likely in one of the many archival fires or wars of the 16th century. What we do know is that these coins circulated widely, influencing designs as far as the Spanish Americas.

Not every collector realizes this, but the Guldengroschen's edge was sometimes reeded to deter clipping—quite the headache for counterfeiters back then.

Some call it the grandfather of the dollar; that's not far off, though it took a few centuries to get there.