Auction 333-341 Western Australia & Great Britain - Day 3

1857: 1 d. red, Die II, perf. 14, lettered PA, used on cover, London to Liverpool, dated 20 March 1858, tied by London Inland barred cancel in black. To the reverse the rare Pearson Hill Experimental Trial 'Transit' Machine cancel in black, Machine 'C', Code 'C' (Day Code C), with Liverpool arrival in blue-green alongside (MR 21). Rare; earliest recorded usage and one of two known on cover.