Back in the mid 1970's, long before mobile phones, my parents decided that some form of communication was required between the house and the garage. Therefore a trip was organised to a well stocked, old school, government surplus store that use to exist in Swindon where the "ethos of the business" appeared to be "stack it high and sell it cheap". I remember going into this shop periodically in the 1970's and there use to be multiple quantities of all manner of government surplus.
I remember the trip to buy the field telephones and sure enough, there was 2 or 3 dozen Type J Field Telephones to choose from. They weren't tested and you just paid your money and took your pick (while keeping your fingers crossed).
I believe that the correct battery for these telephones is 3 volts and has long since been unavailable. If memory serves me correctly my father, incorrectly, used a 4 1/2 volt battery taped to the back of the phone, of a type now also unavailable.
I recently brought these phones inside form the garage where they had been stored for years and cleaned them up a bit. You do see similar phones listed on eBay as being from WW2 but I believe the Type J came into service post WW2.Information
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