Yes, this one is special...!
See how the maker put a slight camber in the hafting groove?
Gives the axe a better cut - a "slicing"-like strike, making wood cutting more efficient, less tiring...!
Some of these bigger axes I have posted don’t have a nick on them. I would bet they were picked up in the 1800s when farmers used the 24” mouldboard. To find one like that in my old fields would be next to impossible because of the machinery they use.