For sale is a very rare Frank Holton & Co. Chicago 19 cornet mouthpiece, stamped with patent date and mouthpiece serial number. Condition of the silver-plate is great, and there are very fine dings, dents, and scratches throughout. These do not affect the playability of the mouthpiece. The claim of the patent on the rim design is to alleviate. Such paralysis and increase the endurance of the operator, inasmuch as to provide a means whereby the vibrating lip of the player is relieved without detracting in any way from the quality of tone produced. Cup inner diameter is approx. Overall length is 2.245? , and throat is 0.151? . Shank end outer diameter is approximately 0.332. Feel free to reach out if you have questions.