black datestamp on yellow cover to Norwich, Connecticut with "Singer's Sewing Machines, Geo. D. Grave, Agent" cornercard, franked with three 1868 2c Black "Z" grill (85B) tied by fancy star in circle cancels, rated as triple weight so "Due 3" handstamp applied in Hartford, original invoice enclosed for "4 rubber rings" and "2 doz. needles", very fine and rare, 2003 Philatelic Foundation certificate