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Old Aulos Trebles.
Old (discontinued) Aulos trebles.
The model without a number has no 'step'
at the lower end of the middle joint. (See below.)
The left hand model was good in its day.
The middle model was short lived and rather 'clicky' to play.
The one on the right, 209N was a winner.
The step the lower end of an Aulos body joint.

The old model Aulos 311 Tenor.
The now discontinued Aulos 311 tenor.
It shares the same head as the keyless 311N model.
The head is prone to breakage at the ridge above the bulge.
An effective and invisible repair may be achieved with 'superglue'.
The key is made of plastic and breaks easily.
On this model the outside diameter of the pad cup is 17mm.
There are no longer any replacements available.
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