cover BASEL: 1726-1849 entires or entire letters (35), comprising unframed straight-line "DE BASLE" (3, W.5 and 6a (2)), similar "BASLE" (11) and "BASEL" (3), slanting straight-line "über/BASEL", unframed "BASEL/DATE" (W.2408) and red circular datestamps (13); a good variety of additional postal markings are noted including "zu spät" in red (5, three types), unframed "PP" in black and red and accountancy markings