Made of cardboard used as a training aid, so one sailor can use the front side designed to look like a Naval signalling light to send Morse code message by pressing down on the card at the top to show signalling light to the other sailor who then can decode the message with the help of the Morse code decoder on the back
Size Hight 68mm Length 65mm Depth3mm
Patent number 2376586
Bureau of Naval Personnel - training aid
Condition is "Used". But looks like they been issued but not used, but if so very little. Please study all pictures as they are a large part of discrimination/condition
Dispatched with Royal Mail 2nd Class.
Please be aware that this item is an antique or vintage collectable and as such may have minor surface wear and tear, small blemishes commensurate with age and usage. Any damage which I feel detracts from the item will be mentioned in the description or be shown in photos. Items are sold by description & photos and I am always happy to answer questions.