Page ii Advertisements 'The Motor Cycle' APRIL 14TH, 1949 contains this advert.
But it is all in black ink on a uniform medium blue background, presumably in deference to the nick name for 'The Motor Cycle'.
That was the 'Blue 'Un'.
In The Motor Cycle Advert, the Shanghai version's yellowish background has gone blue and the fluffy white cloud behind the inn sign has disappeared.
I do not know which is the original version.
Maybe the yellow version is a Photoshop reworking of the 1949 Advertisement?
Perhaps David Wright's book on Vincent Adverts ( which I do not have ) may clarify this?[/QUOTE]
Here's a scan of page 134 from David Wright's book. No cloud and green tinted paper FWIW.
Mark