Hi Mina, Thank you for contacting Mearto with your appraisal inquiry. Based on the photos and information provided, and subject to examination, this is: A Custom Kanstul silver plated cornet Probably a Bb model, serial number 4356, late 20th/early 21st Century Bell engraved "Custom Built / Kanstul Music / Anaheim, CA / USA" with Vincent Bach 3C mouthpiece and protective travel case approximately 16 inches long CONDITION: This cornet appears to be in very good condition; value assumes the musicality of this instrument is good and that it has no dents, repairs or losses. PROVENANCE: Unknown $600-900* *represents a fair-market value for auction purposes; retail or asking price may vary. Please let us know if you have additional items to appraise, or questions/concerns, and thank you again for using Mearto. ~ Delia