I posted this in the leather forum in te thread on round knives, but thought I'd repost it here. Another bargin out of the kitchenware section of a thrift store.
One side
Other side:
And the side of the handle:
I looked it over real good last night, I'm not sure what it was made out of, but I'd guess a saw blade. It appears to have been cut out hot with a chistle, then straightened with a hammer by a very skilled blacksmith. You can feel a lot of hammer marks in it, but can't really see but a few. From the scale on it, I'd guess it was heat treated when done.
BTW the riviet is lead.