There were mainly two colours: brown (early) and green (late). However, there were shades of each and it has always been difficult to exactly match colours.
Here’s a photo of my collection of Naim Olive items from 18 months ago to illustrate my point.
The colour changed over time. The story I was told by Naim’s head of QA was that the fellow that the fascia supplier who was responsible for mixing up the colour passed away. With him went the formula, so whoever took over would take one of the facias from the most recently made batch and then would try to match up the colour as closely as possible. What inevitably happened was that the colour started drifted from a fairly brownish olive, to what it eventually was, which was a rather grey olive green. By the time Naim found out what was happening, it was too late…
Naim used to offer a fascia matching service through the service dept. and many fascias have been swapped around over the years accordingly, so if you have an early unit with a grey olive fascia, or a late unit with a brown olive facia, now you know why…
Bottom 2 are 135s. Reboxed in about 2002. Brownest. They are matching in colour. I think the flash is distorting it.
But maybe the rebooked ones got older fascias.
[Edit} Having read Richard’s post above it seems they got browner over time. I had assumed brown was to some extent a deterioration. So the colour range of mine makes sense.