Hey everyone!!!
I've just puchased an EKO Rio Bravo 6 here in Argentina (where I live) for $300. I know I have probably been mugged, but I tried almost 40 different guitars from Takamine (EG, EAN and EF series), Ibanez (PF and AW series), Taylor (100 series), Fenders, here and in South Africa for as much as $1400 and this was the best sounding of them all, by far. It has no electronics and it is in fabulous conditions, which makes me suspect of its year of manufacturing. It must be around the 80's. The only 3 differences I noted from what I could see in the catalog pictures in fetishguitars.com, is:
1)the saddle string pins are arranged in a semi-circle
2)the bridge itself is height-adjustable via two screws
3) the black truss rod cover has the words "reinforced neck" in chrome

I hope we can share our EKO pride and find someone to ask about serial numbers.

Take care!!!