6904-414 CHAMPION adjustable nut and pipe wrench. Patented 3/15/21 by Paul Tumulla of Chicago. Nut and pipe jaws in head that slides and is locked by squeezing the handle. The Champion Wrench Co. was formed the following year to market "the greatest improvement since the monkey wrench" but it sank without a trace. A rare wrench in very clean condition. Good+ (TBI353) 60 - 120