Hi glisuni.
Looking to your pictures, I definitely think that the rug dealer mention "Abrash" to explain these colour differences. This is a Kayseri rug that would be around 40-60 years old in my view.
Also from your second picture, the dark red part looks like being repaired. This may not be a recent reparation - maybe done 10 years ago. But it would explain the colour difference and why that part looks in better condition than the rest.
From your wider picture (3rd one), I think (but cannot see in detail) there is a another section (a thiner section/strip on the left side of the picture) that has been repaired.
I hope this helps :) Let me know if you have other questions.
Hakan Guzelgoz
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