[GreenKeys] Here's an odd device - Teletype and Morse?

[Jim Haynes]

I'm going to offer a guess.  Something Western Union would take to
a sports event like a baseball game to report the game back to the
telegraph office.  Pre-dating Model 31, so an earlier KSR printer would
be too heavy for the operator to lug to the press box.  But the TTY
keyboard would allow faster transmission than a Morse key, and would
allow the telegraph office to copy transmissions on a printer.  The
Morse sounder is there so the telegraph office can communicate back to
the operator, who would know Morse.  And the Morse key is to give him
a way to communicate with the office until the printer connection is
established.

This is only a guess.  If you could inspect it you might find the Western
Union name on various pieces of it.