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A post war used AB412 but maybe confirmation of Army Auxiliary Workshop B.37.
email (option): robmiller11(a)yahoo.co.uk
I think it may very well be a "B 32" and not "B 37".
The symbol looks very much like many others in the Norton admin.
Nice not anyway!
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Good find Rob M! But I agree with Rob vdB, I'd also say that this looks more like a 2. Same "symbol" as on the receipt card below, and there was typically a 2 years guarantee, not 7.
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I think you are right.