Schrade Cut Co Large Double 3 3/4 inch Black jigged switchblade knife

Vintage Schrade Cut Co Large Double 3 3/4 inch Black jigged switchblade knife made in Walden, NY sometime between 1916 and 1946 and designated the model 7504 3/4. It measures 8 1/8 inches open with brass liners and nickel silver buttons and safeties. It's a Clip/pen blade combo and both blades are nearly full and shiny with some light scratches and a few light pepper spots. Main clip blade is stamped SCHRADE CUT CO WALDEN NY on the front and small blade stamped US PATS DEC 21, 09, SEPT 13, 10 and JUNE 6, 16. The scales are black jigged celluloid, referred to as Stagged scales in Schrade literature and in great condition with no cracks or shrinkage. The knife works well with both blade tips below liners closed, open fully and good lockup with about 1/16" up and down at the tips. Does rattle if shaken when open. Safeties work. VG+ condition.