The 6¢ stamp was issued March 19, 1869. Its earliest known use is April 26, 1869, and has as its largest known unused multiple, two blocks of 16 and several blocks of four used. The 6¢ stamp paid the double weight domestic letter rate as well as the 6¢ rate to Canada, Great Britain (after January 1, 1870). It was also used to make up higher rates to various foreign countries including Italy, Peru and India, and was even used in inter-consular mail to and from China and Japan.
