This is a neat, business cover(relatively clean; w/ some wear and tear in the form of creases here and there) sent from San Juan(w/ a pretty nice strike of the machine cancel!), Puerto Rico, U.S. Territory, to a Dr. Thilo and Company, Mainz, Germany, on May 25, 1920! The sender was with some kind of company in San Juan, a Coll Y Compania! As for the pair of red, 2-Cent, and green, 1-Cent, "Washington," U.S. definitives, they are in very fine condition! Noted imperfections aside, this is a really nifty uncommon piece of Puerto Rican and German postal history!