What other country was the queen who launched Dannebrog, also a queen for between 1918 and 1944?
HDMY Dannebrog (A540): Her Danish Majesty's Yacht "Dannebrog" (A540) (Danish: "KDM Dannebrog" ) was launched by Queen Alexandrine at Copenhagen in 1931, and commissioned on 26 May 1932. Alexandrine of Mecklenburg-Schwerin:  She was also Queen of Iceland from 1 December 1918 to 17 June 1944.
i don't know