Thanks for the advices!
I wish I could buy one for this price, sadly I think is quite difficult to find a bargain llike that nowadays (at least online). The price for the one I've seen on ebay is definitely higher. The info and the photos of the listing are quite detailed though: the stick and the battery compartment look good, and it has an small crack in one corner of the frontal lens. The screen looks good too. It has some scratches on the plastic case. I don't know the policies of this forum regarding external links, I could put the link if it's allowed, anyway is not hard to find it on ebay if you wanna take a look. Educated opinions (not like mine) regarding the price for this one in particular it would very helpful. Searching for Rosy AVs sold on ebay I had found just a couple: one MIB sold for 700 euros and another without package, not working with batteries but working with charger: it was priced 250$, best (unknown) offer accepted. Now I see another one was sold recently (very fast I guess, because I didn't even see the listing) for 100GBP (131$), without battery cover. So, that's the way things are...
Regards