I have received from the Italian Posts the special philatelic stamp with Guglielmo Marconi from the 30th radio exposure of Montichiari (BS).
The picture with the special card to commemorate the 100 years of the first transoceanic transmisison is available here: http://i259.photobucket.com/albums/hh311/francesco1958/File0359.jpg
(Source: Francesco via Larry Van Horn)
(Source: Francesco via Larry Van Horn)