Historical information

Found by an abalone diver at wreck of the Corio.
Alfred Graham & Co was a British company which was founded in the 1880s. They developed a niche market for ship's phones. They had gone out of business by the end of the Second World War so this object would be pre-1945.

Physical description

Metal speaker system unit - circular, instructions for use inscribed on front.

Inscriptions & markings

Front: 'Press plunger to call distant station
Speak close into mouthpiece
Lift right hand tube to ear
Patent Navy Phone
Alfred Graham & Co, London'
- all capital letters