Looking around the 'net, one razor I've seen is one that looks to my untrained eyes to be a 40's style Super Speed. But the knob on the ones in question is black. Reading the Wiki on date codes.variants etc., I see no mention of a colored knob on the 40's SS. So, am I mistaking something else for a 40's SS, or is this a variant that is not noted in the Wiki (and if so, do you have any other references to them, and possibly a range of dates for them?).
TIA for any help.
TIA for any help.