Knuckleball Schwartz of the Washington Senators.
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sandy kofaux was the first to perfect the curveball
you can throw a great knuckle curve by not snapping ur wrist bur holding i side way towards h ground 4 extra roation use a trditional knucklecurve grip
Middle Finger
Who Knows. An effective curve is 70's to low 80's. Any faster and you might as well throw a slurve or slider.