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I believe you knife handles are made out of Nacre better known as mother of pearl. Mother of pearl is the common name for iridescent nacre, a blend of minerals that are secreted by oysters and other mollusks and deposited inside their shells. The shell of various species are used; pearl oysters and abalone are both sources ; that is cut into various shapes and admired for itsÂ’ brilliant reflective colors and nearly translucent 3 dimensional appearance.
I am afraid the silver-plate mark EO&co is unknown to me.