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My own private Morse key collection
KEY 3

G.N.T. CO. Type: No. 601 In their catalog from 1926 called
The instrument factory of the Great Northern Telgraph Company, Copenhagen, Denmark.
The wooden base is not the original
This key is from 1892-1893 arcording to the references at GNT.

Key no3, in the main unit is stamped the the serial number 19392
this key was used by the Danish railroad "DSB" back in the 1880 - 1940 where they used morse to tell when trains where comming.
The key was then original mounted in another and mouch bigger construction you can see it in the Danish Post and Tele museum under article number 369 and 390
By the way another Danish Museum also has this similar key in their exebision, visit The Danish Technical Museum.
It was made by the Danish company called: "The Great Northern Telegraph Company"

The small 'leaf' contact springs, was also used on German keys, back to 1900.
This design was used for at least 50 years and maybe longer.

Here is just a couple dimensions for verification:
The beam itself is 9.20mm wide, by 147.31mm long by 13.57mm thick
The two small brass bases holding the contacts
Are 74.75mm wide by 14.0mm deep by 7.47mm thick
The three terminal screws are 11.9mm in diameter