Hi All, I'm tyring to find out what I have. My grandfather gave me a knife he carried before WWI. It is a Schrade Cut. Co. Walden NY Marked on the long blade and US pats. Dec, 21, 09 & Sept 13, 10. There might ba a forth line on the short blade, but my eyes are not that good. It is a twin swing open spring system with round buttons and a switch lock on each side. The body sides are made of sterling silver. The knife is about 3 3/8 inches long. Any help would be greatly appreciated. Sincerely 1873.