Special auction

Italien: 1861, 1/2 tornese black on thin paper in block of six color proof without embossing and dou
1861, 1/2 tornese black on thin paper in block of six color proof without embossing and double print on reverse 2 grana in blue, as described on page 113 of the Catalogue Enciclopedico Italiano, issue 2004/05, without gum in good condition, cert. Dr. Avi, rare!