Penny knife
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The penny knife is the most basic kind of folding knife, where the blade folds in and out of the handle freely without a spring or other locking device to hold it in position. The smallest models of Opinel knife are an example of this simple design, consisting only of a blade pivoting on a rivet through a metal collar around a wooden handle.
It was particularly common in the French infantry of the Consulate (1799 to 1804).

