This large, uncommon, airmail cover(has some stains and wear and tear around its edges in the form of creases and nicks of various sizes; back flap is intact, but has creases) was sent on May 27, 1936, from the Boston Area(pretty fine, duplex, Bangor & Boston T257, R.P.O. cancels!), Massachusetts, to the Annapolis Banking and Trust Company, Annapolis, Maryland! The sender was the future Rear Admiral Joseph Patrick Canty! He was a lieutenant at the time serving on the U.S.S. Eagle #19, an Eagle-class patrol craft that was one of many, anti-submarine vessels of the United States Navy that were built during World War I using mass production techniques. They were steel-hulled ships smaller than contemporary destroyers, but having a greater operational radius than the wooden-hulled, 110-foot (34 m) submarine chasers developed in 1917. The submarine chasers' range of about 900 miles (1,400 km) at a cruising speed of 10 knots (19 km/h; 12 mph) restricted their operations to off-shore anti-submarine work and denied them an open-ocean escort capability. Their high consumption of gasoline and limited fuel storage were handicaps the Eagle class sought to remedy. While many of the Eagle-class ships would no longer be in service by WW2, the #19, had been, but was destroyed somehow/for some reason in 1946. As for the three, red, coils, 2-Cent, "Washingtons," the stamp to the right is in fine-very fine condition! Unfortunately, the other two have some shorter perfs at their left sides. Noted imperfections aside, this airmail cover remains a neat piece of U.S. Naval postal history connected to Boston, Massachusetts, the Bangor & Boston R.P.O.,  Annapolis, Maryland, and future, U.S. Rear Admiral, Joseph Patrick Canty, then serving as a lieutenant aboard the U.S.S. Eagle #19!