Imperial standard of Iran
The Imperial Standards of Iran (Persian: پرچمهای سلطنتی) were the personal official flags of the Shāhanshāh, Shahbānū, and Crown Prince of Iran, adopted at the beginning of 1971. The official flag of Shāhanshāh consisted of a pale-blue field with the flag of Iran in the upper left corner and the Pahlavi coat of arms in the centre.
Source: Wikipedia — Imperial standard of Iran (CC BY-SA 4.0)