
The provided search results confirm the existence of the 1878 Silver Dollar but do not specify its metallic composition or silver weight. Based on established numismatic and historical data, an 1878 Morgan Silver Dollar contains 0.77344 troy ounces of pure silver.
This figure is derived from the coin's official mint specifications. The total weight of a Morgan Dollar is 26.73 grams. The coin's composition, as mandated by the Bland-Allison Act of 1878, is 90% silver and 10% copper. Therefore, the actual silver weight within the coin is 90% of the total weight, which calculates to approximately 24.057 grams. These specifications were standard for all Morgan dollars minted from their first year of issue in 1878 through their final minting in 1921.


