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Here are a few for WWll !! They made many different styles depending on the use and which branch of the military !! There were also weight requirements and if the knives didn`t meet those, weight could be added in that hole !! If you have never shopped at a military surplus store,, you would be surprised at what you find !! Many years ago I bought a British Enfield 303 rifle from a metal trash can full of them !! That was at a K-Mart department store !!