Hammer Brand Imperial Serpentine Jack Green pearl vintage switchblade knife

Vintage Hammer Brand Serpentine Utility Jack Green pearl switchblade knife from the 1950s made by the Imperial Knife Co of Providence, RI and was designated the model JM98PB. The knife measures 3.5 inches closed and 6 1/8 inches open with brass liners and nickel silver plated button and steel safety. The clip blade is 99% full, or better with most of the original finish with some light scratches and a little light pitting and the tang is marked HAMMER BRAND USA with a picture of an arm holding a hammer and the back is marked P 2170537 over 2281782. The handles (scales) are hollow steel with celluloid wrap in Green Pearl which is not common and are in good condition with some shrinkage. The knife works well with the blade tip seating deep and centered when closed, strong snap and TIGHT lockup open. Does NOT rattle if shaken with the blade open. Safety works. EX condition.