Originally Posted by T-Mar

I concur, it was manufactured in 1984. I don't know the model. At the time, the Columbus SL model was the Gap, while the the tretubi Columbus SL model was the Arrenacia. I doubt this model was even stocked/catalogued in the USA. High grade mixte frames are hard to value. There's not a lot of demand but then there's also not a lot of supply. This is the kind of thing I'd put on Ebay and hope to get a bidding war started.