1950's Dukoff fluted chamber tenor saxophone mouthpiece, s/n 707. These mouthpieces have a very unusual design: the interior has vertical ridges which extend from the baffle to the shank. The sound and response is a lot like a good vintage Florida Link. 

The mouthpiece itself is in excellent overall condition. The table, tip and rails all look great and it doesn't appear to have been refaced. The tip measures .071". 

The mouthpiece plays very well. It is very free blowing and has a full sound from top to bottom. Although it's relatively closed by modern standards, I like how this one plays currently. This would be a great candidate to get opened up to a more modern tip.