Press Button Knife Co medium double MOP pattern 105 antique switchblade knife

Antique Press Button Knife Co medium double MOP pattern 105 switchblade knife made in Walden, NY sometime between 1892 and 1923. It measures 3 3/8 inches closed and 6 15/16 inches open with brass liners and nickel silver buttons & pins. The spear/pen blades are both 99% full, or better with original crocus finish under some spotting and the tangs are stamped PRESS BUTTON KNIFE CO WALDEN, NY and the backsides are blank so likely made between 1912 and 1923. The Mother of Pearl scales are Gorgeous with no cracks. The knife works great with strong spring so both blades kick back, but both lock up Tight in the full open position. No rattle if shaken with blades open. EX+ condition.