Hong Kong 1862 96c Olive-Bistre Unique Block of Four Postage StampsHong Kong 96c Olive Bistre Unique Block of Four Postage Stamps For Sale: 960,000. 00 Unique colour error block of four in outstanding condition A legendary philatelic item the treasure of Hong Kong postal history Shows an additional error of watermark Previously housed in the most respected Hong Kong collections Description The unique 96c olive bistre colour error right margin block of four with full original gum, superb centring and exceptionally