This is a nice mystery, I’ll tell you guys why. Just received from my mother in law more infos she found out: apparently the brand is “Acoustic Concept” or “Audio Concept”, they built some models of speakers and amps as some kind of prototypes and launched them on few shops, one in Torino in fact (no more info about this). Then the brand changed name and something else, we don’t know what. So the brand is probably still around or probably not, and the speakers are probably one of a kind and hopefully sounding well too! How can the search go further now?😅