how big is a silver dollar in millimeters

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The dimensions of a United States silver dollar vary depending on the specific series of the coin. Based on numismatic data, the standard diameter for the most widely recognized historical silver dollars is 38.1 millimeters. This measurement is consistent across several major issues, including the Morgan Dollar, which was minted from 1878 to 1921, and the Peace Dollar, produced from 1921 to 1935.

This 38.1 mm standard was also maintained for later large-format dollar coins, such as the Eisenhower Dollar, circulated from 1971 to 1978, and for modern commemorative dollars issued from 1983 to the present. Therefore, when referring to a traditional U.S. silver dollar intended for circulation, 38.1 mm is the correct diameter.

However, it is crucial to distinguish these coins from the American Silver Eagle. The American Silver Eagle is a silver bullion coin that has been issued by the United States Mint since 1986. While it has a face value of one dollar, it is primarily an investment vehicle. This particular coin is notably larger, with a diameter of 40.6 millimeters. Consequently, the precise size of a "silver dollar" in millimeters is contingent upon which specific coin is being referenced.