The Free Sate of Gotha continued the using of the flag of Saxony-Coburg-Gotha.
Source: Volker Preuß
Area: 546 square miles
Inhabitants: 189.200 (1919)
Density of Population: 346 inh./sq.mi.
Capital: Gotha
Currency 1918–1920: 1 Mark = 100 Pfennig
Source, by: gonschior.de
14th of November in 1918 · fall of the monarchy in the Duchy of Saxony-Coburg-Gotha
12th of April in 1919 · separation of Saxony-Coburg-Gotha into the Free States of Coburg and Gotha
1st of May in 1920 · the Free Stae of Gotha dissolves into Thuringia
Source: Wikipedia (D)
The name of the town Gotha goes back to a mention in a document in 775 as "Villa Gothaha". Gothaha means "good water".
Source: Wikipedia (D)