Audi gt coupe Quattro type 85. What are they worth today?????

Hello all together. Unfortunately, I did not find a compartment for this model. hope you don’t stone me ^^ So my question is following. Have to buy a genante car in front of me above. Audi GT Coupe type 85. Is ten Quattro 5 cylinder – 136 hp clearo EZ 12.85 so just before the h registration running power 340 tkm. But think this is not so important. 1 previous owner otherwise extras: Is the model sitting with the red leather. Are of course finished as mostly original steel sliding roof that was believed to be condition I can not say anything. Do I have to look at the car first. But is so unbasked and original at first. I ended up with the seller at 5600. What do you think! Is this ok normal or rather favorable Have the with time and work worth sustaining or increasing ?