£25
British WWII Admiralty Pattern 378A signalling Heather type made by Renfrew Electric and Refrigeration Co Ltd. They clamped to a top fixture of either a telescope or binoculars (aboard ship) and
and were used only at night to send traffic from ship to ship. I assume the different lens shades were selected based on light conditions at the time it was being used. In excellent condition with original paper instruction, but missing its battery.
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