The closest flag I could find in the ten minutes of Google searching I could allot is the flag of the kingdom of Württemberg (1805 - 1918). It's just missing th

The closest flag I could find in the ten minutes of Google searching I could allot is the flag of the kingdom of Württemberg (1805 - 1918). It's just missing the yellow circle. Coincidentally the coat of arms involves a yellow oval and would often be placed in the centre of the flag. https://en.m.wikipedia.org/wiki/Kingdom_of_W%C3%BCrttemberg https://en.m.wikipedia.org/wiki/Kingdom_of_W%C3%BCrttemberg