That half-round cut is where you would expect to find a keyway.
There are a number of possible explanations for it being there, but we cannot really say with any certainty why it is there.
If the blade is truly old and genuine, something that from the photos I am inclined to doubt, the original fit of ganja to pesi may have been done with keyway and key (pin), on the other hand, if it is not old and genuine, perhaps the maker may have tried to fit with a key, but found he had made the ganja hole insufficiently neat to allow a key fitting, so he resorted to using a slip, or a wedge of metal, as we can see.
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