I bet one of you can shed some light on this. The kiddo and I were going through a pile of auction loot, and found a saw I haven't seen before. It's the right one, it's got a copper clad blade. It's in very good condition, has definitely been used, and is not a show saw or something like that. Also has strange bolts and nuts. I can't find any markings except the 8 stamped on the heel.

Anyone know anything about these? I've never seen one.