After having lived in France for about 5 months, I came across a street vendor on Rue Ramuteau selling this classical guitar for 50€. It was strung with six strings of the same gauge, just to keep tension on the neck, I suppose.
After a set of new strings and some time to accommodate to being a proper guitar again, it holds a tune for a while, and doesn't sound half bad.
It looks to be an older model Eko, an italian manufacturer. I don't know exactly which model it is, because the number is worn off of the label behind the soundhole.