Here are 5 Retro Revival Mouthpieces with the same tip opening 7* for easy comparison. I included the Tru-Res, Tru-Slant, Shorty, Stubby and 7th Avenue South, which are replicas of the vintage Otto Link Slant Signature, Res-O-Chamber, Selmer Short Shank, Dukoff Stubby and Guardala MBII, if I'm not mistaken. The different character between each mouthpiece is easy to hear. Which sound like the real deal mouthpiece to you?