remove the handle, wrap the bit in a wet towel, weld the divot
I hate to be a checkbook owner but in this situation I both: have a ton on my plate at work & home; and have no real experience welding much other than thin gauge metal/stock. The cast iron I've welded has been been quick & dirty exhaust manifold fixes in a pinch (while waiting for a replacement to arrive). I don't know that I trust myself to properly weld this thing.
Is there a person or company that I can send this axe head to for a proper identification, evaluation and then either perform repair/restoration or recommend someone? It'll fit in a USPS small flat rate box and I'm happy to enclose a pre-paid return return postage label so someone can put hands on it. Her grandfather was a tool & die maker so for all we know if that notch didn't come from Collins he could have put it there on purpose and the crack came from her dad using it as a wedge. Her other grandfather just turned 89 and "remembers that old red axe" and the shenanigans/stories that come with it. With the holidays coming up (someone reminded me last Friday that we are 90-days from Christmas) it would be a nice gift/gesture to return the axe repaired. (or show it to them and hope they don't ask for it back)
Thanks.