I inquired of the owner about the decal set on this bike, below is his answer. I would guess that the saddle B-17 is not correct and a later add on and although I did not ask, a repaint and rechrome. I will inquire again. Hetchinspete.
"The down tube decals which I think you are referring were copied from some old photos ;they are not exactly correct I am advised.As you probably know this bike pre-dates the "fairground" type decals. I am recently reliably informed that the lettering is more or less correct, but they were white with a fine black suround, (this could be acheived with a mapping pen) I hope this helps answer your enquiry" Nick