Looks like the result of a "soft" crank, hence no wear in the oil groove areas of the crank journal. Very common to grind thru the cranks surface hardness when their ground undersize like this, leaving the crank journals soft and vulnerable to rapid wear. Some cranks are heat treated deeper than others and have no isssues when reground. A sharp crankgrinder operator can usually tell by how the journals "spark" against the grinding wheel whether the crank is soft or not if he is aware of this in these cranks. Regrinding this crank wont make it better unfortunately.
