Man that's beautiful! Charlie, let me know if you come across any culls

. I don't think that the split spring requirement automatically makes a knife a "whittler". I've come across a number of senators and sleeveboards that fit the spring requirement, but had a file for one of the secondary blades, definitely not what you could consider a whittler, although I suppose the file would make a passable rasp in some instances

. To me, a whittler should contain a coping, cut off pen, or small sheepfoot blade as well as the split spring setup. (That's just IMHO, not something I've seen in writing). Here are a few shots of some senator and sleevboard split spring examples with files:
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The thing of it is, I don't believe cutleries of at least the early twentieth century actually made knives that were considered a whittler pattern. There are just senators, sleeveboards, balloons, sepentines, cattle and stock knives. From what I can find, not until Schrade added the clipped pen blade to the "mechanics" serpentine was there any mention (at least from Schrade), of a knife devoted to woodworkers (carpenters). Now of course you have knives designated as whittlers, and now canittlers. The most recognizable whittler being the balloon frame , I also added a canittler shot, both from CS (well they're staffed by Schrade employees after all!

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Eric