Probably the most famous user of a Schrade Sharpfinger knife is Sonny Barger, founder of the Hells Angels Motorcycle Club.
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Marc "Animal" MacYoung and Fred Perrin hold favorable views of the Sharpfinger as Animal discusses in his book "Knives, Knife Fighting and Related Hassles" and the Nemo Sandman site for Fred Perrin in the 90's.