SHAPLEIGH HDW CO DE B19 Medium double MOP switchblade with etch

Vintage SHAPLEIGH HDW CO DE B19 Medium double MOP switchblade with etch made by Schrade Cutlery Co of Walden, NY sometime between 1916 and 1946. The Shapleigh catalog number for this knife was B19 and it measures 3 3/8" closed and 7 1/8 inches open with nickel silver liners buttons and safeties. It is a Spear/pen blade combo and the blades are both full with much of the original finish and original blade etch that reads "Diamond Edge" with a diamond between the words and the letters DE inside. The pattern number "B19" is also etched on the backside of the large blade which is stamped SHAPLEIGH HDW CO around a diamond with letters DE inside. Small blade is stamped US PATS DEC 21, 09, SEPT 13, 10 and JUNE 6, 16. The original Mother of Pearl scales (handles) are in perfect condition with beautiful luster! The knife works well with both blade tips below liners closed, both open fully with very good lockup open. Small blade has kickback (blade opens too fast to lock so bounces back). Comes in an old leather knife purse. Both safeties work. EX+ condition.