Presto Cigar Jack Single Jigged Bone switchblade knife

Presto cigar jack switchblade knife made by the Geo Schrade Knife Co of Bridgeport, CT sometime between 1940 and 1956. The knife measures 3 3/8" closed and 6 inches open and it has brass liners and nickel silver button and safety. The blade is 98% or better with light scratches and patina and the tang is stamped PRESTO over PAT JAN 30-40 over MADE IN USA and the rear is stamped G SCHRADE over KNIFE CO INC, over B'PORT, CT USA. The Jigged bone handles (scales) are in good condition with a couple of small cracks along the edge on front scale. The knife works good with the blade tip seating deep when closed, good snap and good lockup with 1/8" up and down a slight side to side movement at the tip open. Rattles if shaken in one direction. Safety works. VG+ condition.