Warburton 9* Series 80 trumpet backbore. The 9* makes a great orchestral backbore. Series 80 refers to the heavy weight aspect of the design - similar to other heavy mouthpieces like the Bach MegaTone but without the necessity for a larger throat size. In very good condition with a little tarnish. Please see my other listings for various other mouthpieces etc including a few more Warburtons.
eBay