You could be right--I can see that notch, but I'm still not sure it's not a damaged/different punch.

These are after all, date punches which see a lot more use than hubs in die making.
Look at the top of the 8s in the second date--that weakness is common for worn punches too.
In the context of
US coins, here's an 1882
IHC with a damaged punch:
