That would be machined off. Now there might be a way to test the snout material and tell if it is cast iron or steel. I only know of how to do that on a grinder and tell from the sparks!
To really know about the whole balance situation, one would have to examine the 'guts'. See if rods are stock or modified or replacements, look at the crank type, see if there is heavy metal slugs in the counterweights, and so on.
The only other suggestion I have on externally visible balance clues is to remove the inspection cover a slowly rotate the crank 360* and carefully examine the flexplate and torque converter for weight. You have to read up and know what you are looking for... a TC can have small weights on it that are simply for neutral balancing, not for actual external weight. But it still would be a useful thing to do. Take pix.
If you have a manual trans, then the holes for external balance will be harder to spot.
Either way, it helps, but does not 100% tell you the whole story. It is conceivable to externally balance the rear half and internally balance the front half! (It seems like that type of situation showed up here in a thread 1-2 years ago....)
BTW do you think you are having engine balance issues? If so, what are the symptoms?
Or is this just about getting the damper marks all straightened up? I don't want to spin you off into left field on a wild goose chase! You have enough to do that IMHO ought to come first, like figuring out the cam specs and cam timing.