Decime Coin: France's First Decimal Currency System

Illustrated Specimen Details: 1 Decime (French Republic)

Example Specimen: 1 decime, 1796 (French First Republic)

Authority & Heraldry: This historic copper coin was struck during the era of the French First Republic. The obverse features Marianne, the iconic allegorical image of the French Republic, depicted as a young woman wearing a Phrygian cap (a symbol of liberty and the revolution). Below her portrait is the calligraphic signature of the renowned coin designer and General Engraver, Augustin Dupré. The reverse bears the inscription "UN DÉCIME" (one decime) surrounded by an oak wreath. The date is specified according to the French Republican calendar as "L'AN 5" (the 5th year of the republic), which corresponds to 1796 in the Gregorian calendar. The coin also includes specific mintmarks: the mythical goddess Artemis with a bow, a rooster (the mark of Mint Master Charles-Pierre de l'Espine), and the letter "A" designating the Paris Mint.

1. FRANCE (18th-19th centuries) — French Republic and the French Empire: 1 decime = 10 centimes = one-tenth of a franc.
2. REPUBLIC OF GENEVA, SWITZERLAND (1794-1795): 1 decime = one-tenth of a genevoise.
3. PRINCIPALITY OF MONACO (1838): 1 decime = 10 centimes = one-tenth of a franc.

The Decime as a Coin Name. The decime (in French "décime") is a historical coin of France and several other Francophone territories, serving strictly as the tenth part of the main national currency. The name derives directly from the Latin word "decimus", meaning a tithe or a tenth part, exactly like its Spanish equivalent, the decimo coin.

While most numismatists immediately associate the decime with the French First Republic and Napoleon's Empire, the denomination actually originated a year earlier outside of France. It first appeared in the neighboring independent Republic of Geneva (now a Swiss canton). Silver Geneva coins in denominations of a half decime and one decime were dated 1794. Here, the decime represented one-tenth of the short-lived genevoise currency, which circulated for barely two years (1794-1795).

In France, 1 and 2 decime coins were widely issued during 1795-1800. A defining characteristic of these 18th-century revolutionary coins is their dating system: they used the French Republican calendar (created during the Revolution and used from 1793-1805). For example, the earliest French decimes bear the date "L'an 4" (Year 4), which translates to 1795. Later, the Principality of Monaco also adopted the denomination, minting copper and bronze decimes featuring the portrait of Prince Honoré V exclusively in 1838.

Historical Background and Decimalization

The décime emerged during the radical political and monetary reforms associated with the French Revolution. Before these changes, French currency relied on a highly complicated, non-decimal system based on livres, sols, and deniers, which made accounting and everyday trade cumbersome.

The revolutionary government sought to rationalize and simplify commerce by creating one of the world's earliest fully decimalized currency systems. Under this new structure, the principal unit—the franc—was cleanly divided into 10 décimes and 100 centimes. The décime served as the perfect intermediate circulating denomination between the base unit and the smallest fractional coin. This logical, mathematics-based structure proved incredibly successful and eventually influenced monetary reforms throughout Europe and the Americas.

Physical Characteristics and Numismatic Legacy

During its prime, the décime was struck in various base and precious metals, including heavy copper, billon, and silver. The most common issued denominations included 1, 2, and 5 décimes. The designs were heavily steeped in republican ideology, frequently featuring liberty figures, national coats of arms, oak branches, and prominent denomination inscriptions to emphasize clarity over royal portraiture.

As the 19th century progressed, the centime eventually took over as the primary fractional unit in everyday commerce. By the early 20th century, most franc-based systems had entirely phased out the term from official coinage. However, the legacy of the word survived long after the coins vanished; in parts of Switzerland and France, "décime" remained a popular colloquial term for a ten-centime piece for generations.