E2a (E2b) 1904 15¢ on 15¢ ultramarine Coat of Arms "EXPRESS DELIVERY" overprint, surcharged in red, ERROR - "(INLAND)" inverted, quite rare, lightly canceled, one of only about three known, massively undercatalogued (previous examples have sold for a multiple of Stanley Gibbons!), a world class rarity, ex-Franklin, ex-Rubin.
