How to Identify the Maria Theresa Thaler

What This Coin Is

The Maria Theresa thaler is an Austrian silver trade coin that has been struck, officially and semi-officially, continuously since the death of Empress Maria Theresa in 1780. Because of its trusted silver content and design, it became a standard trade coin across parts of Africa, the Middle East, and beyond, and mints in several countries have produced authorized restrikes, all still bearing the original 1780 date.

Obverse Design

The obverse shows a veiled, draped bust of Maria Theresa facing right, with the legend M THERESIA D G R IMP HU BO REG (Maria Theresa, by the grace of God, Roman Empress, Queen of Hungary and Bohemia).

Reverse Design

The reverse shows the double-headed Habsburg eagle with a crowned shield on its breast, surrounded by the legend ARCHID AVST DUX BURG CO TYR and the date 1780.

Size, Weight, Metal, and Edge

The coin is struck in .833 fine silver, weighing about 28 grams, with a diameter of roughly 39–40mm. A distinguishing feature is the incuse (recessed) edge lettering reading IUSTITIA ET CLEMENTIA (Justice and Clemency), which appears on genuine strikes.

Mint Marks and Where to Find Them

Because every restrike carries the same 1780 date, telling an original strike from a later restrike depends on small details rather than the date itself: look for tiny mintmark initials near the date or along the truncation of the bust, which indicate which mint (Vienna, Günzburg, Rome, London, Paris, Brussels, and others have all struck official versions over the years) produced that particular coin.

Telling It Apart From Similar Coins

The main identification challenge with this coin is not confusing it with a different coin, but determining whether a given 1780-dated piece is a genuinely early strike (rare and more valuable) or one of the very common later official or unofficial restrikes, which still contain real silver but were produced decades or even centuries after 1780. This is done by comparing mintmark initials, edge lettering sharpness, and overall strike characteristics to reference examples from known mints.

Judging Condition

Examine the high points of Maria Theresa's hair and bust for wear, and check that the edge lettering is crisp and fully readable, since well-struck examples show sharp incuse letters all the way around.

Authenticity Red Flags

Poor quality or blundered edge lettering, incorrect weight, or a dull, grainy surface can indicate a low-quality tourist copy rather than an official restrike. Because so many legitimate restrikes exist, a Maria Theresa thaler is rarely a "fake" in the sense of being counterfeit silver, but buyers should understand that an 1780 date alone does not indicate an 18th-century strike.