Thank-you Charlie,
I think that's the American version by the bag top; NO BAG SLIDE.
I have boxed-; 612,652,652B & 1334.
I know there was the cream/brown with black pinstripe bag 612 as well as the blue/grey with black pinstripe bag version.
If their was a Wells 638 I think it must have had a very short production run.
A good friend and fellow collector who has loved cleaners all his life and who is now 62 is sure he remembers a neighbours daughter having one circa 1958?
I wonder if one will turn up sometime?
Kind regards, Walter.