I saw a rug exactly like this on ebay awhile back (it was in CA, USA), I bid on it (but not enough), thought it was interesting, but no idea what the writting says.

Nice rug. Counting 17 x 17 knots per inch makes 289 kpsi or 440.000 knots per m². So it is a rather medium weave, less than 50 raj. Jewish design tableaus are not very common, but Tabriz makes some of them as well as christian motives. So calling it a historical rarity is a bit too much - the appraiser might not have specific experience in pectoral rugs. Also it is rather new - probably made within the last 5 to 15 years. Possible a rug collector who badly wants it for its collection may go a little higher in price, but average retail value for a rug this qualtiy would hardly extend 1300 - 1600 USD. The stains should be no big problem. Ebay is probably the best way to sell it since you get a lot of viewers. Also offering it at a price at AUS$ 6000 with giving the buyer the chance to make an offer is fair - you will see what the market will bring. Donating it to a museum is also a good idea.