With three ostrich feathers emerging from a golden crown and with the motto "Ich Dien", this is the heraldic flag for the Prince of Wales. The German motto of "Ich Dien" is a contraction of the phrase "I serve". An uncommon flag that we haven't encountered.
Condition is fair for this printed linen flag, with the color remaining even, though with some separations, and stains. No great amount of loss. Image size is approximately 28 x 33.5 (inches)