DescriptionFirst day cover: First American Troops Arrived in France. 20th [Twentieth] Anniversary, U.S.A., France. 1917 --- June 26 --- 1937. Postmarked Hoboken, June 26, 1937. 3-5/8" x 6-1/2" wide. Significant to Hoboken because as the Main Port of Embarkation for U.S. Army troops in World War I, those first troops would have left from Hoboken. Cachet sponsored by Bloch R.C.D. No. 142 as printed under vignette. "R.C.D." stands for Royal Canadian Dragoons which appears to make this United States postal item sponsored by citizens of Canada or the British Empire. A local affiliation or actual location of the post or lodge has not been found. Addressed to a Mary Burns of Boston Mass.