Permission granted by Mr. Gregg who combined the flags and made them. See source for where image was taken directly from..
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This work has been released into the public domain by its author, Thomas M. Gregg. This applies worldwide. In some countries this may not be legally possible; if so: Thomas M. Gregg grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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Captions
Regimental and Company colours of the 1st Prussian Infantry Regiment