Ah, well, too bad! Once I Googled ice saws, I was able to find several pictures matching this one.
I briefly considered removing the handle and using it to make a large frame saw like Adam Cherubini's, since the teeth are already pretty close to the required profile, but the video of the ice festival convinced me to keep it intact (I remember camping at Tobyahanna as a kid!). I will clean it up and put it in usable condition, never know when I might get a chance to try it in the wilds of Mass, Maine, or New Hampshire. Ice harvesting used to be big business up on the Kennebec river.
I do have a couple of two-man crosscuts in better shape, maybe I'll convert one of those to a frame saw. I'll just have to spent more time with the file.