Press Button Knife Co Medium double Ivory cell Columbian Steel Tanks switchblade

Antique Press Button Knife Co Medium double Ivory cell Columbian Steel Tanks switchblade knife made in Walden, NY sometime between 1892 and 1923. The knife measures 3 3/8" closed and 6 15/16 inches with both blades open and has brass liners and nickel silver buttons. It's a spear/pen blade combo and both blades are full with original crocus finish with light scratches from use and both are stamped PRESS BUTTON KNIFE CO WALDEN, NY on the tangs and backsides are blank which means it was likely made after 1912. The scales (handles) are ivory celluloid and have advertising on both sides with front reading COLUMBIAN STEEL TANK CO K.C.M.O and the backside reads TANKS FOR THE WORLD and are in excellent condition. The knife works like new with both blade tips below liners closed, both open strong with some kickback and both have excellent lockup. No rattle if shaken with blades open. EX+ condition