Sonneberg area were mainly manufactured at home. In addition to the term world toy city, Sonneberg advanced to become the “workshop of the Santa Claus”. From the 1870s onwards, the toy industry did not respond to increasing demand and falling sales prices with a transition to industrial production in larger factories using innovative techniques. Even if exports to the US rose by around 600% between 1865 and 1885, in 1880 85% of the companies had just four employees. [10] It was the number of these traditionally working small and micro-businesses that increased tremendously in response to the increased demand. In 1880 there were a total of 321 companies. 1899, almost 20 years later, 2395, an increase of 746%. One of the heydays of the toy industry led to the development of the station square with representative buildings in the 1920s. First, the US company Halbourn built a six-story trading house that has been owned by the AOK since 1925. Opposite it, in 1926, the American department store company F. W. Woolworth Company, which had been purchasing locally since 1880, built a trading and warehouse for the purchase and export of toys and Christmas tree decorations. The five-storey reinforced concrete building with its own siding was built according to plans by the Sonneberg architect Walter Buchholz. In divided post-war Germany, Sonneberg found itself within the borders of East Germany, cut off from its large neighbouring town of Coburg, Bavaria in West Germany and could only face north economically. It was served by an unnaturally winding railway route and thus became somewhat isolated from the rest of East Germany. Sonneberg Hauptbahnhof is served by the Coburg–Sonneberg line. After the fall of the Wall, toy shops were privatized or re-privatized, if they still existed. In 2002 the Thuringian Day took place in Sonneberg. The city became a member of the European metropolitan region of Nuremberg in July 2012, initially on a trial basis, and has been a permanent member since October 2013. The 14th Franconian Day was celebrated on July 6 and 7, 2019 by the district of Upper Franconia together with the Bavarian state government and the two host cities Sonneberg and Neustadt bei Coburg for the first time across borders with over 25,000 visitors under the motto: GEMEINSAM.FRÄNKISCH.STARK. Sonneberg is a location with a close network with hydrogen initiatives in the metropolitan region of Central Germany and it is a member