i have since short two 1940-47 service manuals in my possesion.
Both are softcovers about the bigtwins, 1 is lightblue, the other is green.The green 1 is a reprint for sure, it says on the first page:copyright 1986...partnr 99482-7 reprinted9/86 , so thats clear.
The other is the same size,also 165pages, thicker and rougher paper and no reprint references.On the greencover the guy on the bike has no hat visible, on the blue you see nearly the complete hat
The pictures however seem darker and i don t know how the original is supposed to be , so i have my doubts!
Presently i have seen purple ones, maybe mine is an early reprint , who knows what is what, and how you can see the difference?