7401-90 GOODELL-PRATT No. 316 chain drill. Designed to be used with drills that didn't have integral chain drill; you loop the chain around the wood being drilled and it helped force the drill through the work. The deluxe model with patented feed rate adjuster. These are usually found in dog meat condition but this is very nice with near perfect japanning and no rust. Fine (MGE153) 30-60