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Well, I realize I'm answering my own questions here but I figured someone else might find it useful. Here is some information I found on tang stamp identification....

Interestingly, as soon as I had finished posting this thread I looked one more time and found this listing...
337576

...which is exactly the same knife but searching under the many listing names...

Today unloading a toolbox I am retiring I rediscovered this Camillus.
337573
337574

I know it belonged to my late father in law and I thought as did my wife that it was a phone company knife...