In the GDR the company 'Zeuke und Wegwerth' announced their TT scale models on the fair of Leipzig in 1957. They came on the market in 1958 with a complete set of one diesel and two steam trains with freight cars, coach waggons and rail track. Because of the smallness of the TT gauge which fitted better in most houses and the lower priced models it became quite popular in the GDR. In the summer of 1972 Zeuke was transferred in a state guided company called 'Berliner TT Bahnen', shortly BTTB.
Because Zeuke had left the company, BTTB was not anymore that creative as 'Zeuke und Wegwerth'. But BTTB produced in large quantities and exported their products for a large part to Eastern Europe. Following German reunification, the company was turned over to businessman Carlo Parisel.
Parisel modernized the manufacturing facilities and brought marketing expertise to the company, intending to market his product to the entire world. His efforts reminded the rest of the world not only that TT scale equipment was available, but that TT is a viable modeling scale. In Autumn, 1993 Berliner TT-Bahnen was sold to Tillig Trains and Track. In 1992 a complete line of high quality, ready-to-use TT track products was introduced.
What's it worth? Take a look at this Zeuke price guide: sold listings for a value indication.