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Silver plated Alto (sanded), specially made for the Barcelona International Exhibition, in 1929

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Model 28 Alto saxophone

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There are very few "Model 28" saxophones in existence. They are contemporaries of models released the same year which themselves did not bear a name, continuing until 1931.
In 1929, an alto was released with a larger bore than that of Model 28, and was named by the Americans New Largebore.