[R651400]

When you think you've seen them all another strange type pops up!
The handle (if that is what it is) indicates a portable signaling unit but why would the lamp be pointing backward?

 

[R651400]

Could be HW but that handle indicates it carried some weight by presumably a batter pack under the key which would have connecting wires..
Putting the key back to front by it's operator would surely constitute a penalty of fifty lashes or even keel-hauling !
The key appears bog-standard early 20th century and the switch was normally the send/receive on a transmitter key-line that carried a hefty (even lethal) voltage..

 

[R651400]

May I suggest image #1 is the portable keying unit for a ship's mast-head signaling lamp which would be connected to a socket on either the ship's port or starboard bridge wing ..
The case lense/bulb would give the operator a close-hand visual indicator of his/her morse sending..