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A swage is a top and bottom tool used to work hot metal into shape. Bottom swage fits in the anvil, the top swage held in a wire handle.
Nothing is known of the origin of this bottom swage. A swage is a top and bottom tool used by blacksmiths to work hot metal into shape, and swages are made in any form required. The bottom swage fits into a swage hole in the anvil and the top swage, held in a wire handle or shaft, is struck by a sledge hammer or hammer.

1 bottom swage: metal