This is a 1964-67 Getzen 300 series trumpet that appears to be in excellent condition. Getzen is based in Wisconsin and was founded in 1939. They produce professional as well as student-grade instruments. Their 300 series trumpets are seen at auction and tend to go for as low as $45 and as high as $100, depending on condition. Based on this, the Fair Market Value of your instrument is between $80 and $100.