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Hi ron This panel is from a bike which had a resistor type device fitted I believe it was common in the era of 3 brush Dynamo So perhaps mid 30’s I had a couple which came with 8” headlight - DU142 I had one in brass at one stage Br Job
email (option): jonnyob1@googlemail.com
Ron Pre war missing the resistor for a three brush dynamo. So pre 37. Used on DU42/C shell which have the mounting bolts fixed in the shell. IE the thread comes from inside the shell, not into it like later DU42
Thanks guys. Ron
email (option): ronpier@talk21.com