Hi: My GW NEW YORK VINTAGE HARD RUBBER SERIES IS SOLD ON EBAY. IT HAS A THICKER OR BIGGER BODY THAN YOUR EXCALIBER. THERE IS MORE RING TO THE SOUND THAN THE RESIN MATERIAL USED IN THE AIZEN SO CALLED MEYER COPIES. THE EXCALIBER TO ME IS MORE LIKE A GREGORY MOUTHPIECE. WHILE MY PIECES SOUND AND PLAY LIKE THE VINTAGE MEYERS OF THE THE 1960's. YOU CAN HEAR A SOUND CLIP OF MY PIECE ON www.neffmusic.com Alto mouthpieces \ If you search GW mouthpiece on ebay you will see what is currently available. THANK YOU FOR YOU INTEREST AND MESSAGE, GREG WIER - GW mouthpieces