Flag of Greece At the flag's centre, the royal coat of arms of the new dynasty (Schleswig-Holstein-Sonderburg-Glücksburg) would feature. By a new royal decree of 3 June 1914, the distinguishing flags to be utilised by the various members of the royal family were described. The king's flag was defined as being square in shape and, as in previous flags, featured the coat of arms of the king on a Greek white-cross-on-blue. As the king at the time, Constantine I, was made a field marshal the previous year, the coat of arms on his flag featured a heraldic representation of the Marshal's baton in
Flag of Greece other designs surviving until that time. No other designs and badges can be shown on the flag. To date, no specification of the exact shade of the blue colour of the flag has been issued. Consequently, in practice hues may vary from very light to very dark. The Greek Flag Day is on 27 October. The old land flag is still flown at the Old Parliament building in Athens, site of the National Historical Museum, and can still be seen displayed unofficially by private citizens. The use of the Greek flag is regulated by Law 851. More specifically, the law