When did the father of George J. Gruen pass away ?
Dietrich Gruen Dietrich Gruen (February 22, 1847April 10, 1911), was a German born watchmaker who emigrated to the United States in the 1860s and later founded the Gruen watch Company.
George, Duke of Mecklenburg George, Duke of Mecklenburg (German: "Georg Herzog zu Mecklenburg" ; 5 October [O.S. 22 September] 1899 – 6 July 1963) was the head of the House of Mecklenburg-Strelitz from 1934 until his death. Through his father, he was a direct descendant (great-great-grandson) of Russian Emperor Paul I.