1866 - 20c on 15c light blue, Type III horseshoe o

 1866 - 20c on 15c light blue, Type III horseshoe overprint with ‘XVIII’ dotted numeral cancellation, alongside the double-circle ‘POSTA MILITARE ITALIANA (N.18) 17 LUG. 66’ on the front, on cover addressed to Chiavari. E. Diena initials (25). Cover mentioned on p. 208 of the book 1866. La terza Guerra d'Indipendenza. La Posta Militare Italiana, study by Carra-Carraro, 5 recorded documents. Manzoni certificate