Eric,
I have never seen a DP without a hilt. My observation as a comparison to the #10 was grind, blade stamp placement, etc....not to infer that it, indeed "was" a Model #10 blade. If it had been made from 3/16" stock, a broken Model #6-9" or the like could have been the origin. In 1/4" stock, those possibilities are off. Below is a close up of the area I was referring to. 1st shot is my Griffin DP and the 2nd is a #10-5", customed-up for me by Dave Griffin..."at the Randall shop"!
You knife is a "way-cool" piece and I would love to have it. Good luck with it.
Best, Capt. Chris