Hello, Please do add one more photo of the front of the pin. You can do this with the paper clip icon or add files button.
This is a 1952 Modernist Sterling Silver Trumpeter brooch by Sam Kramer (American, 1913 to 1964). He was a very famous eccentric jeweler and artist. His more elaborate pieces are in museum collections.
The semi-precious stone used for the trumpeter's head is a chalcedony cabochon stone and the foot is an amethyst cabochon stone. This piece has a value of $1,000.00 to $1500.00 currently. Pins and brooches are not as collectible as hair combs, necklaces, bracelets and rings made by him.
I will warn you that a person on Ebay is asking 5,000.00 for one. That is not realistic.
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