I'm not sure of that one...but I do know that the earliest versions did not have teeth as seen in my photos below:
The above image is a framed ice axe that I have on my wall. I believe this one was homemade as there are no markings denoting a company of any kind and it's teeth are barely visible.
The two on the sides that are longer have no teeth...age is unknown by me but it would seem that axes with teeth are newer then axes without....I'd email Neptune Mountaineering in Boulder, CO since he has such an extensive collection of mountaineering gear..