I don't know, Bukhara. The fringe doesn't look like ordinary cotton (perhaps mercerized cotton, viscose or silk), the knot density mentioned would be unusually fine for wool, and the blue on the close-up is also rather shiny for wool.

Carola, could you get photos as described in the "Rug Images" section? This would help.

Your rug seems to be in quite good condition. If it is a 10 x 10 as you counted, the retail price in Germany would be around 2500 - 3000 Euro (for Germany including 19& Vat / Salestax) for a new Hereke silk rug like this.