David calls this a semi-plateau or semi-Mazzeo, because the ring finger keys and left thumb key are plateau style, but with a hole in the middle. Futuristic city 3d wallpaper/screensaver. I would think that having the hole would be preferable, as it would prevent a dull, stuffy sound for middle C, low A, and open G if those pads were too close.

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On the other hand, a student needing a plateau style horn is likely going to have trouble covering the little hole in the middle. The instrument doesn't seem to have the most important part of the Mazzeo system, the register key mechanism, so semi-plateau would be the best description.Normal clarients have all three rings connected, so when you push onedown, all go down. However, this mechanism allows the last (plateau)key to move separately from the other two keys.

The Mazzeo mechanism on this Signet clarinet allows the player to switch between 'Mazzeo' mode and regular Boehm. The plunger mechanism turns the Mazzeo system on/off. To disconnect you simply push the mechanism in. To reconnect you pull it out.

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Most of the pads are olds and will soon need to be replaced.Rosario Mazzeo was a member of the Boston Symphony Orchestra for more than 30 years. He worked with the Selmer company in trying to improve the Boehm system. This is a mid 1960s Selmer Signet Special Mazzeo model. It is complete and not cracked. This is a wonderful collectable vintage clarinet. Sold with a Selmer case, but no mouthpiece or accessories.All reasonable offers considered. Please ask any questions prior to purchase.