cover A collection of "GB" marks with "1F220C" in blue (3) used between 1862-64 on covers from Shanghai and Hong Kong, 1863 "1F620C" on cover from Hong Kong to France, 1866 "1F26C" on blue cover from Japan to Amsterdam, 1866 and 1870 "1F66C" on wrappers from Hong Kong to Reims and Amsterdam; a valuable lot. (7)