As of my last knowledge update in January 2022, there isn't a widely recognized or documented case of a 1794 Flowing Hair Silver Dollar with a silver plug.
However, it's important to note that the field of numismatics is dynamic, and new discoveries can occur.
The 1794 Flowing Hair Silver Dollar is highly prized by collectors as it represents the first year of production for the United States dollar coin.
These coins were struck with a silver composition of approximately 89.2% silver and 10.8% copper. The term "silver plug" typically refers to a small piece of silver inserted into a coin to adjust its weight or correct a planchet flaw.
If there is a claim of a 1794 Flowing Hair Silver Dollar with a silver plug, it would be crucial to verify the authenticity and provenance of the coin.
Numismatic experts, grading services, and reputable dealers play a crucial role in authenticating and documenting rare and unique coins.
For the latest and most accurate information regarding a specific coin or discovery, it's recommended to check with reputable numismatic sources, auction houses, or relevant institutions specializing in coin authentication and historical documentation.
Additionally, contacting the Smithsonian Institution, major numismatic organizations, or specialized experts in early American coinage might provide further insights into such unique and extremely rare pieces.
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