Mammoth, Ariz. Oct 16, 1888 (Pinal), cds (Meyer 1, rarity 6) with matching fancy "$" in circle handstamp tying 2¢ Banknote on cover to Tucson, straight line receiving postmark on reverse (type 17A, four known), with original enclosure from San Pedro; cover edge wear and small tears, F.-V.F., the unique example of this Mammoth postmark. Estimate  $200 - 300. $0 (Image)