Treasure Hunt 3

NEW SOUTH WALES-FRANCE. 1878 Cover franked with engraved 8 pence yellow Diadem (Sc 58), prepaying the single weight letter rate to France via the San Francisco route, and tied by numeral SYDNEY duplex cancel. Front shows violet “1½D” credit handstamp, red LONDON/PAID transit, and red ANGL/AMB. CALAIS F French entry. Reverse bears ROCHEFORT-S-MER arrival datestamp. a very scarce transpacific and transatlantic item