Ok...........A is the older one. It has come to my attention that C might have a separate ganga, so maybe pushed back to 1910s-1920s.
On copper baka-baka clamps: I think it was more of expense and status rather than age. Often these baka-baka (the Mindanao term) were made of copper, silver, swassa/suassa (a gold/copper alloy), or steel.
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