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An official restrike of the 1486 Tiroler Guldengroschen

The Guldengroschen was a large silver coin originally minted in Tirol in 1486.

The Guldengroschen's name comes from the fact that it has an equivalent denomination value in silver relative to that of the goldgulden (60 kreuzer). In the latter years of the 1470s and early years of the 1480s Sigismund of Austria issued decrees that reformed the poor state of his region's coinage by improving the silver fineness back to a level not seen in centuries (.937 pure) and created denominations larger than the ubiquitous, but fairly low valued Groschen of 4 to 6 Kreuzer that were in use.

In 1484, small numbers of "half guldengroschens" valued at 30 kreuzer were issued. This was a revolutionary leap in denomination from the smaller pieces, and surpassed even the large testones of Italy which were the highest weight coins in use. Finally in 1486 the full sized guldengroschen of 60 kreuzers was put into circulation and it was soon nicknamed "guldiner". For a long time thereafter such coins were also called "unciales" because their actual silver weight was very nearly one ounce. As large quantities of silver became available other states began issuing guldiners of their own. Bern, in modern day Switzerland was one of the earliest to follow Tirol by issuing its guldiners in 1493. In 1500, Saxony's mint at Annaberg took minting of guldiners to new heights and the economies of central Europe welcomed these large new coins.

Guldengroschen

The original Tiroler guldiner was designed so that eight coins minted would weigh in pure silver at one Tiroler Mark. This was fine for Tirol, but much of Europe was accustomed to measuring by the more widely used Köln (Cologne) Mark. The penultimate development of the guldiner occurred in 1518 when the Joachimsthal mint in Habsburg-controlled Bohemia slightly altered the weight of the coin from 31.93 g down to 29.20 g. This made it possible to mint nine guldiners to have the silver weight equivalent of one Köln Mark, rather than the eight in Tirol. This new coin was known as the Joachimsthaler (Joachimsthal guldiner), but like the guldengroschen being contracted to guldiner, the joachimsthaler became known simply as the thaler. This new coin was an instant success and was the great grandfather of many other similar weight coins like the daalder, dollar, tolar, tallero, etc.