value of Brilhart Tenor Hard Rubber

I bought a Brilhart Tenor Hard Rubber mouthpiece in about 1962, played it for a short time and went back to alto. Sold the tenor and kept the mouthpiece. I decided to sell it and washed it, where it took on a different patina. There is a very tiny crack at the tip but you would need a magnifying glass to see it What is the reasonable expectation of value? Many thanks.

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