Giovanni Lanza's signature.
Traced in Adobe Illustrator from http://cgi.ebay.it/Autografo-lettera-Giovanni-Lanza-Ministro-interni-1864_W0QQitemZ400093654850QQcmdZViewItemQQptZLibri_e_mappe?hash=item5d2770af42#ht_2854wt_939
Giovanni Lanza