£10
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 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. Collectable military equipment.
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