"REGISTERED ST. THOMAS JY 28 70", red oval handstamp on registered cover with 1867/80, 3 d. rose, plate 5 and 1 s. green, plate 4 with clear "C51" and adjacent red "ST. THOMAS PAID" to Philadelphia with frontside cds. "NEW YORK REGISTERD". The stamps with minor imperfections, top back flap missing, otherwise very fine and attractive; only very few registered letters of the British PO at St. Thomas recorded (SG Z7, 29)
