Well, when I bought it i didn't know, but now I suppose it is a Titan made by Billato. It has a lot of similarities with Titan models, it is almost identical to the Titan which belongs to my friend and also the serial numbers are matching. The ex owner says that the name of my frame starts with B so i think it is made by Billato(because i heard that Billato was a contract builder who made frames for Titan).