All of these guesses were killing me, so I got out my Sellens book. It is on page 20. It is a Lathrops patent belt awl, as in leather drive belting.
An awl used for making the lacing holes in webbed or leather belting material. The belt awl is heavier and stronger than the Harness Awl or Thong Awl. The patented awl shown in the illustration has a cutting edge that can be used for opening the hole. Also called a Thong Awl by some suppliers.