Alan, yes parallel development could certainly explain why a choil might be found on knives of a single ethnic group from Luzon. After eliminating external influences it really is the only explanation left.
Attached is an example of a Canary Island knife (Spanish colonial). Would you consider this shape to also be a choil? It's sometimes referred to as a "Spanish notch."
Ian
-----------Canary Island knife-------------
Last edited by Ian; 16th July 2018 at 07:35 AM.
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