The oldest surviving specimen of saxotromba dates from 1849, a three-valved instrument now in the Basel Historical Museum, while the youngest surviving example is a six-valved instrument from 1864 now in the Musée de la Musique in Paris.
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These pitches are known as the instrument's natural or normal modes of vibration, each one being a natural harmonic or open note.
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A recent translator of the Treatise, Hugh Macdonald, doubts that Sax ever produced as many models of saxotromba as he did of saxhorns - Berlioz (2002), p. 304-305.