They are sambar for sure..... and VERY nicely matched side to side. They appear to fit quite well also. If they feel good in your hand you have hit the jackpot ! ... They look to be possibly made "back in the day" by "Ajax" or Eagle" . You didn't ask about value, but I think $350 for a pair like that is fair these days.
My pics are of my favorite elk antler N frame pair.

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Y. B. Ord & A. Ree