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Does your knife say "Old Crafty" on it?
Looking at your pictures I don't see were that knife says "Old Crafty" on it anywhere.
Without seeing the blades opened and without knowing the closed length of the knife to the nearest 16th inch we don't know exactly which model of Schrade that knife is patterned after, but I am quite confident that Paul is correct that your knife is patterned after the Schrade open Stock series model 832.
It could be that Sears ordered a model 834 with modified handles, the type of handles they used on the 832 after they stopped using wood on the handles. The difference would be the 832 would have a pen blade for the third blade and the 834 would have a spey blade for the third blade.
I have a number of “Old Crafty” knives made for Sears and they all look like the Old Timer series of Schrades and they are all marked "Old Crafty." All have the saw cut Delrin handles the same color as the Old Timer knives and they have the same shield as the Old Timer knives except the shield says Old Crafty. The tang stamps for the Old Crafty that is the same size as the 34OT says: CRAFTSMAN/U.S.A. 9546. They do not say Old Crafty on the tang stamp, at least none of the examples I have seen say that.
Your knife has the same tang stamp as my Craftsman #9546 but it does not have the Old Crafty shield or handles.
I believe yours is a variant of the Craftsman #9546, but not an Old Crafty.
Schrade made a lot of knives for Sears and it is possible to find variations of many models that they made. Over time the availability of materials would change, especially for handles, so it’s possible to find several variations of the same model number of knives, both Schrade and Craftsman.
And sometimes they would change handle material just for a different look. Schrade is famous for that very thing, making several knives that are essentially the same with different handle materials. I believe Case does that even now.
The #832 Paul mentioned in his post was originally made with PropWood handles, (whatever PropWood is), but in later years it was switched to a Delrin handle very much like the handle on your knife.
Here is a picture of my Craftsman Old Crafty #9564.
I would be very interested to see the blades of your knife to know if the third blade was a spey blade as it is on my Old Crafty 9564 or if it is a pen blade as originally appeared on the Open Stock #832.