Yeah, if you can pull that front cap off and look for some casting marks.Usually a crank that heavily shot peened is cast. I had a Scat cast steel crank that was peened heavy like that. Never saw a 4340 crank that heavy.
Scat and many others put their info on the fron of the fron counterweight. Its hard to see with the front main cap in the way sometimes. Might need to remove it.