What is the value of a Union Latine gold coin today?
Union Latine price history
Intrinsic value based on the gold price
How much does a Union Latine gold coin weigh?
The Union Latine coin has a total weight of 6.4516 grams. This weight includes the coin's complete alloy.
Taking its purity of 900‰ (90.0%) into account, this coin contains exactly 5.8064 grams of pure gold.
What is the purity of a Union Latine gold coin?
The Union Latine coin has a purity of 900 thousandths, i.e. 90.0% fine gold.
This purity is characteristic of coins struck in France between 1816-1823. The rest of the alloy (10.0%) is generally composed of copper to strengthen the coin's durability.
Obverse
The term "Latin Union gold" covers a homogeneous set of coins issued by the signatory countries of the 1865 alliance (France, Belgium, Switzerland, Italy, Greece). Leading the group, the French 20 francs or (or Napoléon) constitutes the cornerstone of this system, with a diversity of effigies that reflect the political upheavals of French history.
Typology of effigies and artistic signatures
Diversity of reigning and republican portraits: Depending on the period, the obverse bears the portrait of Napoleon I, the laureate or non-laureate profile of Napoleon III (Second Empire), or the great allegorical figures of the Republic (Cérès, the Coq or the Marianne by Chaplain).
Titles and legends: The inscriptions are adjusted to the political regime in place (e.g.: NAPOLEON III EMPEREUR or REPUBLIQUE FRANÇAISE).
Master engravers: The initials or signatures of the greatest artists of the Monnaie de Paris mark the dies: Auguste Barre, Jean-Jacques Barre, Louis-Oscar Roty or Henri-Auguste Patey.
Point of vigilance (Distinguishing types): The investor or collector must take care not to confuse closely related series (such as the Cérès and the Marianne), whose fineness of engraving and relative rarity can influence the market premium beyond the simple gold weight.
Reverse
The reverse of Latin Monetary Union coins follows rigorous graphic codes guaranteeing their mutual recognition and fungibility within member countries, with the French 20 francs issues as the crowning example.
Heraldic composition, values and mints
The standardised structure: For French coins, the face value 20 FRANCS sits at the centre, framed by an oak or laurel wreath symbolising the permanence and strength of the institution.
Historic mint marks: The place of manufacture is clearly indicated by a letter (A for Paris, K for Bordeaux, D for Lyon, BB for Strasbourg), not to be confused with the privy marks of mint directors or the differents of chief engravers.
Allied countries' variations: The Belgian equivalents (heraldic lion and bilingual inscriptions) or Italian ones (20 lire with royal effigies) retain the same weight of 6.45 g at 900 ‰ while displaying reverses adapted to their national sovereignty.
What matters for the investor: Cross-referencing the date and the mint letter makes it immediately possible to identify rare mintages likely to offer a numismatic premium beyond the strict value of the metal.
History of the Latin Union gold coin
Founded on 23 December 1865 by France, Belgium, Switzerland and Italy (joined by Greece in 1868), the Latin Monetary Union foreshadowed modern monetary integration by unifying the circulation standards of precious metals.
Standardised metrology and the epic of the 20 francs
A unified standard: The alliance's gold coins share a rigorous fineness of 900 thousandths (90% pure gold) and a weight of 6.45 grams (i.e. 5.806 grams of fine gold) for the reference denomination of 20 francs (or equivalents in lire, Belgian francs and Swiss francs).
Historical fungibility: This system allowed the mutual acceptance of currencies in all member countries without conversion, akin to a forerunner of the euro.
From Napoléon to the Coq gaulois: Struck in massive quantities from the Napoleonic Wars to the eve of the First World War, these coins form the historical and quantitative bedrock of the current investment gold market in France, commonly known as "Napoléons".
Price evolution of the Latin Union gold coin over the last twenty years (2005 to 2026)
Driven by their content of nearly 5.8 grams of fine gold, Latin Union coins follow the major trends of the gold spot price very closely, while offering opportunities for moderate premiums over current issues.
Market dynamics and premium management
Long-term surge: In the wake of the gold ounce (which rose from around $400 in 2005 to historic highs beyond $2,000 and $3,000 during the 2020s), the patrimonial value of these coins has been multiplied by four to five.
Premium control: For common types (Napoléon III, Marianne Coq), the premium generally remains low, optimising the allocation of pure gold. Conversely, rare dates incorporate a speculative numismatic premium.
Acquisition strategy: Favouring large-mintage current issues for pure investment avoids the pitfall of a rarity premium that is difficult to recover at resale.
Why invest in the Latin Union gold coin?
The 20 francs Union latine (Napoléon) remains the essential choice and the primary pillar of physical gold investment in France.
Strategic advantages, taxation and points of vigilance
Maximum liquidity: Immediate and universal recognition among all professionals and precious metals dealers in France and Europe.
Accessibility and divisibility: Its moderate unit cost (between €300 and €400 depending on the spot price) offers perfect granularity for spreading acquisitions over time and splitting one's savings.
Protective tax framework: Subject to the investment gold regime (0% VAT on purchase), they allow the choice at resale between the flat-rate tax on precious metals (11.5%) or the actual capital gains regime with a 5% allowance per year after the 2nd year.
Checkpoints: Systematically verify the state of preservation (avoid aggressive cleaning), guard against historical counterfeits through rigorous physical testing, and keep purchase invoices for the tax option.
Frequently asked questions
What was the Latin Monetary Union and what was its objective?
Created in 1865 at the initiative of France, Belgium, Italy and Switzerland (later joined by Greece and other associated countries), the Latin Monetary Union was an alliance designed to harmonise European currencies.
Its founding principle rested on a strict equivalence: each member country struck gold and silver coins according to the same weight, the same purity and the same diameter, allowing these coins to circulate freely and to be accepted at the same value across all partner territories.
What are the iconic gold coins that make up the Latin Union?
The standard coin of this union was the 20 Francs denomination (containing 5.80 grams of pure gold for a gross weight of 6.45 g at 900 ‰).
It includes the Napoléon or and the Marianne Coq (France), the 20 Francs Belge (Léopold II), the 20 Lire (Italy), the 20 Francs Suisse Vreneli, the 20 Drachmes (Greece), but also coins from de facto member countries such as the 20 Pesetas (Spain) or the 20 Dinars (Serbia).
What is the main advantage of investing in Latin Union gold coins?
Their greatest asset is total interchangeability and immediate international liquidity.
An investor who holds a mix of 20 Francs Belges, 20 Lire Italiennes or 20 Francs Suisse owns exactly the same quantity and quality of fine gold as a holder of 20 Francs Napoléon.
They are bought and sold at the same investment gold reference price, offering excellent geographical diversification within a single portfolio.
Do certain gold coins from the Latin Monetary Union have a higher value due to their rarity?
Yes. While the French or Swiss 20 Francs were struck in tens of millions of examples and trade very close to the spot price of pure metal, coins issued by member countries with more modest mintages (such as Greece, Monaco, Romania or Serbia) are significantly rarer.
These so-called "exotic" Latin Union coins combine the tax exemption of investment gold with very high numismatic premiums linked to their scarcity on the collectors' market.
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