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Old 28th Apr 2019, 9:20 am   #4
russell_w_b
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Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
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Default Re: When was the No 12 dial introduced?

The trigger dial photo in 'Atkinson' has 12 C44/1 stamped on it. 1944 manufacture?

'The Telephone Handbook' by Herbert and Proctor was written in 1944 and it only mentions slipping cam dials; doesn't even mention the number 10. So given the inertia of publishing, I would guess 1944 to 1948 as the dates for development and rolling-out.
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