Hi Ian

I have a NOS brown DU42, the switch has the convex letter (not inward), the ampmeter appears to be dated 1 44.

Its not the answer but its a start.

Rob

email (option): robmiller11(a)yahoo.co.uk

Hi Ian’
I think they were post war,
Regards, Tom.

email (option): rustytomm20AThotmail.com

This is the switch from my December 1939 bike with 11/39 ammeter. It must be one of the earliest 'T' postion switches and was wired with dipswitch also.



I thought that the pre-war civilian switches had the "outline" font.