Re: Not a true IBM system!
They never had red stripes until the naughties...
The original systems were always beige side panels or IBM Blue and the front panel a contrasting colour of black(assuming you accept black is actually a color).... its only since the x-box generation did they switch to black. Amdahl systems were of course red...
See this picture http://blogs-images.forbes.com/davidewalt/files/2012/03/ibm-system-370.png