Puerto Rico, 1899, 10¢ brown, type I, in combination with 1899, 1¢ green + 2¢ carmine + 5¢ blue + 8¢ violet brown., horizontal pair on registered corner card cover to Aue, Germany, all tied by grid handstamps with purple "San Juan, Porto Rico, Registered, Mar 7, 1900" boxed date stamp additionally tying 10¢, N.Y. etiquette receiving backstamp, Very Fine. Scott No. 214  Estimate $300 - 400. $0 (Image)