Grand Dukes Flag
The Grand Dukes flag had three horizontal stripes of equal size. The top stripe was ultramarine blue, the middle stripe golden yellow and the bottom stripe red (zinnoberrot). Surmounted on the flag located slightly left of centre and the same height of the yellow stripe was an oval shaped shield from the Coat of Arms of Mecklenburg-Strelitz.
National flag
The national flag had three horizontal stripes of equal size. The top stripe was ultramarine blue, the middle stripe golden yellow and the bottom stripe red (zinnoberrot).