Not exactly news, but a brief chat I had with ChatGPT today:
D:
more than one gold coin from around the world contains .1867 oz gold. for example, the French 20-franc gold coin and the swiss 20-franc gold coin. Why is that? What measurement system were they using when those were minted?
Chat:
The reason multiple gold coins, such as the French 20-franc and the Swiss 20-franc coins, contain precisely 0.1867 troy ounces of gold is due to the adoption of a standardized gold content during the 19th century, particularly influenced by the Latin Monetary Union (LMU).
### Latin Monetary Union (LMU)
The LMU was an agreement established in 1865 between several European countries to standardize their coinage. The primary members were France, Belgium, Italy, and Switzerland, with several other countries joining later. The union aimed to facilitate trade and economic stability by ensuring that coins from member countries had the same specifications in terms of weight, diameter, and gold or silver content.
### Gold Content Standard
The standard for the gold coins under the LMU was set to:
- **Weight**: 6.45161 grams
- **Fineness**: 90% gold (or 0.900 fine)
Given the weight and fineness, the actual pure gold content can be calculated as follows:
\[ \text{Gold Content} = 6.45161 \text{ grams} \times 0.900 = 5.806449 \text{ grams of pure gold} \]
To convert grams to troy ounces:
\[ 1 \text{ troy ounce} = 31.1035 \text{ grams} \]
\[ \text{Gold Content in troy ounces} = \frac{5.806449 \text{ grams}}{31.1035 \text{ grams per troy ounce}} \approx 0.1867 \text{ troy ounces} \]
### Historical Context
This standardization allowed for easier exchange and recognition of coins between the member countries. The LMU influenced many other countries' coinage systems, which is why several gold coins from this era have the same gold content.
### Summary
The French 20-franc and Swiss 20-franc gold coins, along with others from the LMU, share a common gold content of 0.1867 troy ounces due to the standardized specifications set by the Latin Monetary Union, which aimed to harmonize the economic activities among its member countries through uniform coinage.