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Old 7th Nov 2018, 12:38 pm   #7
60 oldjohn
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 2,379
Default Re: Reflex Radio Co. Crystal set

Looks like a Red Diamond Permanent detector. Invented 1922, in common use by 1924 so may well have been sold together. These replaced the Cats Whisker. The Post Office number will be of interest because I think the one in my picture had no number.

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