Auction 333-341 Australian States & Commonwealth of Australia and New Zealand – The ‚KOOYONG‘ Collection - Day 2

1878 (Jan 3): 25 c. on 6 d. slate-blue, a single example used on 1878 cover to London tied by "MAURITIUS / B53" duplex in black: the second day of issue. London arrival (Feb 1) and minor flap fault on reverse but an astonishingly early usage of the decimal issue.