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Apparently, this photo is of a Police Pedal-Cycle Receiver showing the loudspeaker earphone clipped to the handlebars and the bag in which the receiver is carried?!
Source: Martin Swift
Also, from an article appearing in the Directorate Intercom June 1972 Journal, in which the photo was courtesy of the Police Journal and with the aid of the Manchester and Salford Constabulary.
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