Greets, and welcome!
Off hand I can't really say - I've seen one Contreras (ever!) and it was so beat up I couldn't really play it.
In the right market it's north of USD1500 (up to 2500/3000 even?), if you can find someone locally who is lusting after a legit Flamenco guitar, then it's a easy sell. But tough to find they person with both desire and $$$
You could advertise on SAMIS (South African Music Instrument Sales, group on facebook). Talk to the fellows at Ronnie's Allbang and Strumit in Jhb (https://www.facebook.com/allbangandstrumit/), talk to guys at the Gear Junkie (www.thegearjunkie.co.za) or you can speak to the only flamenco player I know - Bienyameen (linkedin.com/in/bienyameen-camroodien-2a040175) - he sometimes deals in instruments too, though he's based in Cpt.
I'd try and get hold of Bienyameen - he's probably the best person to gauge the value.