Based on the photographs and information provided, and subject to examination, this is a Matthäus Bauer rotary valve trumpet in Bb, manufactured in Vienna circa 1873. Composition is unlacquered brass and the bell is 5.125" in diameter. The piece has no serial number. A comparable Matthäus Bauer trumpet sold at auction in 2014 for approximately $700 USD without a mouthpiece. The piece appears both nicely constructed and well-kept but its value is impacted by the piece's intonation, valve originality and tightness, and repairs that may not be apparent in photographs. Please let us know if you have additional items to appraise, and thank you for using Mearto.