These are often created by museums to display an extremely accurate replica of a genuine coin for security purposes or to show both sides of a coin at the same time. They are created by pressing the genuine piece into a soft material, thereby creating a negative impression. The inside of that impression is then electroplated to create a shell with the design of one side of the coin. The process is repeated for the other side of the coin and the two sides are then joined together. Electrotypes can often be extremely deceptive. There will often be a seam on the edge, however, and electrotypes are usually not the correct weight. They will also not “ring” like a genuine coin when lightly tapped or dropped because they are not struck.
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