useful data about ear trumpets
image froom KWS 1936 catalogue

If it is straight, it probably isn't an ear trumpet, this is part of an epergne.

Caveat emptor

There is some good advice at The Hearing Aid Museum or read about fakes

A hand cupped behind the ear makes about 10db improvement - a trumpet can be up to 30db

In 1891 the Mc Kinley Tariff Act of America required all imports to America to bear the name of the country of origin. So, an item bearing the words - England - or another country, will probably have been produced in or after 1891.

England or English on manufactured items was started in 1891

Made In England / English Made - will date a piece to after 1921.

On German items

D.R.G.M. registration was introduced 1891 and if you are dating items you should hold in mind that even during Allied occupation up until 1949, registration procedures remained untouched and still used the D.R.G.M. registration documents, which of course explains why D.R.G.M. marks can be found on products actually manufactured up until 1952 as the registration itself was valid for three years. As from the end of October 1952, all registrations were definately marked with 'Deutsches Bundesgebrauchsmuster' (D.B.G.M.)
courtesy http://www.toledo-bend.com

copied from Phisick.com:

The earlier oval cartouche on the (London) dome reads simply F C Rein Inventor 108 Strand and dates the trumpet to circa 1860.

The cartouche reads Down Bros Makers London dating the piece from 1874

Maw and Sons were registered in 1860 and Maw Son & Sons in 1901

Arnold & Sons Surgical instrument manufacturers Giltspur Street, London .

According to Bennion they were in business from 1866.
T Hawksley Ltd., James St., Oxford St., London W1. This firm was established in 1869.

W. H. Bailey and Son. 45 Oxford St., London - at the base of the stem ‘English made’.
They traded in 38 Oxford St from 1894.

Max Wocher & Son Co were based in Cincinnati Ohio from 1897 to 1900.

Audiscope Pat Pend. Amer. Earphone. Co. N.Y. This company made non electronic hearing aids in the 1920s

F C Rein and Son
see makers

Down Brothers
see makers

Hawksley and Sons Limited
see makers

KWS
see makers

Lindsey
see makers

S Maw & Son
see makers

George Tiemann & Co
see makers

Truax Greene and Co
see makers