Flag of Germany
With the formation of the short-lived Weimar Republic after World War I, the tricolour was adopted as the national flag of Germany. Sixteen years later following World War II, the tricolour was again designated as the flag of both West and East Germany divided states in 1949. The two flags were identical until 1959, when the East German flag was augmented with the coat of arms of East Germany. Since reunification on 3 October 1990, the black-red-gold tricolour has become the flag of a reunified Federal Republic of Germany.
Flag of Germany
In addition to the normal horizontal format, many public buildings in Germany use vertical flags. Most town halls fly their town flag together with the national flag in this way; many town flags in Germany exist only in vertical form. The proportions of these vertical flags are not specified. In 1996, a layout for the vertical version of the government flag was established, that co-incidentally matched the pattern of the "conventional" black-red-gold flag of the Principality of Reuss-Gera () from 1806–1918: the is displayed in the centre of the flag, overlapping with up to one fifth of the black and gold bands. When hung like a banner or draped, the black band should be on the left, as illustrated. When flown from a vertical flagpole, the black band must face the staff.