I went down to my P.O. Box yesterday, hoping this knife would be there! I am not familiar with the pattern, and this is the first one I have seen marked Schrade Cut Co..
Of course it is a "regular" Jack, where the end widens or swells. But it is a hair or two over Four Inches long!! Therein lies the rarity!!
And it has all the hallmarks of being an oldie. Arched tang stamps, nice swedge work, and wonderful random-jigged bone like you see on the older pieces from the Walden area; Walden, New York, and Schrade Cutleries shared a bone handle shop, and you will see similarities in their jigging if you study the old knives. Some call it "pick bone".
Without further delay, check this sucker out!!