SHAPLEIGH HDW CO DE B19 Medium double MOP switchblade with etch

Vintage SHAPLEIGH HDW CO DE pattern #B19 Medium double MOP switchblade with etch made by Schrade Cutlery Co of Walden, NY sometime between 1907 and 1916. The Shapleigh catalog number for this knife was B19 and it measures 3 3/8" closed and 7 1/8 inches open with brass liners and nickel silver buttons and safeties. It is a Spear/pen blade combo and the blades are both 98% full or better with much of the original finish and original blade etch that reads "Diamond Edge" with a diamond between the words and the letters D-E inside and the tang is stamped SHAPLEIGH HDW CO around a diamond with letters D-E inside. Small blade is stamped US PATS FEB 13, 06 & FEB 26, 07. The front scale has been replaced with a gorgeous piece of Mother of Pearl and the back scale is original. Both scales are in excellent condition with beautiful luster! The knife works well with both blade tips below liners closed, both open fully with very good lockup open and no kickback. Both safeties work. EX condition.