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Hmmm all wood and brass so probably WW1 or before. Bullseye lens to produce a concentrated beam. Looks like a switch lever on top so probably a battery inside. But to operate the morse key properly you would have to stand in front of the light - strange. If it's WD it will be labelled and have a broad arrow embossed, if it's railway it will still have a label on it.
 

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Hmmm all wood and brass so probably WW1 or before. Bullseye lens to produce a concentrated beam. Looks like a switch lever on top so probably a battery inside. But to operate the morse key properly you would have to stand in front of the light - strange. If it's WD it will be labelled and have a broad arrow embossed, if it's railway it will still have a label on it.
. Many thanks for your information. No markings visible, will open up to see whether any markings inside.
Regards
Geraint
 

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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..
 

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I venture to suggest that is simply a switch for the lamp with the key operating a shutter? The afterglow of a filament lamp makes visual signalling rather difficult. I tried using a cassette player and torch bulb to make a practise set for a deckmate. A failure.
 

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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..
 
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