Vtg 60s Genuine Foremost ENDURO Green Blue Acrylic Lucite Trivet Abalone

So pretty It’s green but I see blue too especially when moving it in the light Abalone shell? Resin? Acrylic? Not sure. USA made 450 degrees heat proof Really nice condition See last 3 pics Has an indentation on the side Not sure what that’s from but minor and not real noticeable. I owned it for a very long time before I ever noticed it. B24