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GPO 4 Pole Jack Plug ~ Black case ~ Ref. No. 420 ~ Solder connections

£8.65

A6423A1 which is embossed on the underside and shown in photograph 4. I do not know who manufactured this example, but no doubt they were made for the GPO / BT by many different manufacturers. If you are reading this you probably know far more about this than I do.

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