Greetings
That is an ER 1912, 1912 refers to the year the of the patent, they were made in very many slightly differing models on both sides of the Atlantic under the Ever Ready, GEM, Star and Treet 'badges'. The factories in Britain were wholly American owned.
They can quite fairly be described as the most successful SE razor ever in terms of numbers sold and the length of their production run which continued from 1913 until sometime just after the last war.
Most of the UK models were made under the Ever ready label but a very few were made in the UK under the GEM label, most of the UK models say made in Great Britain some say made in England. There are very many different styles of handles.
The great majority of them are nickel plated, a few late models were chromed, some are utility models and were left as plain unplated brass.
Production in the UK was at it's height in the thirties which is probably when your razor was made.
They shave beautifully.
Regards
Dick.