more information on the Museum of the History of Science collection
Museum of the History of Science
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Oxford OX1 3AZ
United Kingdom
Two records have come up for ear trumpets:

Inv 45501 Aural Ear-Trumpet, by F.C. Rein & Son, London, c. 1900

Inv 37401 Silver Ear Trumpets, c. 1860

so, in answer to your first question we have a very small selection.

Please see our online database via our website for more details and an image of Inv 45501. There is currently no image of Inv 37401.

Image © Museum of History of Science

Ear Trumpets, the Packington Collection
SY10, Shropshire, UK