Hi, I acquired these cutters when I bought a bunch of stuff and have no use for them. If I can Identify them I could sell or trade them off. I think there gear cutters but haven't been able to find a exact match on what machine they were used on.
Likely HSS so a decent scrap value, perhaps 15 cents a pound.
I used to sharpen pinking blades that performed a similar task, I would grind them viewing through a magnifying glass down to a .002 land...got $12.50 each so a big-money job. They were about 3 1/2 " diameter, I would circle grind and then come into each facet using the oposite side for the index.