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Old 27th Apr 2019, 7:41 pm   #1
giraffenigel
Tetrode
 
Join Date: Feb 2009
Location: Caernarfon, Gwynedd, UK.
Posts: 51
Default When was the No 12 dial introduced?

Does anyone know the rough date the GPO No 12 dial was introduced and if it replaced the No 10 on all models or was there a long crossover period?
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