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**RARE**WW1 Wood Transit Cased 1918 British WD W.D.S.F-K Fullerphone MK III Combination Field / Trench Telephone & Morse Code Set. Sn 22553:17 - 22553:17 The Fullerphone Mk III was a British World War I field telephone and buzzer telegraph system. It was designed for secure communication in trench warfare, where traditional field phones were vulnerable to interception. The Mk III utilized a "buzz chopper" to scramble the signal, making it difficult to overhear, even if tapped directly. It also included a Morse key for sending coded messages and a separate telephone handset. The "buzz chopper" (or buzzer unit) scrambled the signal, making it resistant to interception using Moritz devices, which tapped into the ground return of standard field phones. A folding Morse key allowed for sending coded messages. The handset allowed for voice communication. The Mk III came in a wooden carrying case with a protective lid. The Mk III was developed during the latter stages of World War I, around 1915-1916. The Fullerphone Mk III was a significant development in military communications, offering a more secure way to communicate in the static conditions of trench warfare. Its ability to transmit Morse signals along with speech, and its resistance to interception, made it a valuable tool for the British Army. This is a rare to find example of the Fullerphone MK III. It is complete with its original Telephone handset wired with communication cord and 4 prong plug. The fitted case has the correct terminals for attaching communication wires and is complete with correct folding Morse Key and headset with wired ear phones. The interior is stamped ‘W.D.S.F-K Fullerphone MK III’ together with ‘No. 930’, WD arrow and 1918 date. The inside of the case lid has instructions and morse code plate. The battery compartment with hinged lid has original batteries (not tested). The original wood case has a hinged lid, stencilled lettering, canvas wings for noise and light protection when in use. The case has clasp fasteners and steel carry handles. The case measures 13” x 8” x 7”. The case has no damage. The set has not been tested and we give no guarantee regarding functionality. The price for this rare WW1 communications set includes UK delivery. Sn 22553:17 (storeroom shelves above entrenching equipment)
£495.00
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