Brown olive to Green olive fascia

It's impossible to say.  The change happened incrementally - do a search for the story of why - and as many fascias have been swapped around over the years to match up to a system, there are no hard and fast rules.  Generally though the more brownish olive were the early batches and the greyish olive were the latest batches.  

That answers a question I've pondered for some time as to why my NAXO (1994) & SNAXO (1995) are brown-olive, whereas every other box is green-olive (from a 1998 NAP250  to a 2002 XPS), although my very oldest piece of kit, namely a NAT03 is definately green-olive.

I don't suppose the factory has a stache of green-olive fronts hidden in a deep recess, do they?

And while we're discussing these weighty matters....why does the on switch turn clockwise on a HiCap,  but anti-clockwise on a NAXO/SNAXO?

I remember when I had my olive system I sold and bought a few units to get the colours matching exactly, was a right ball ache! OCD is a terrible thing