1865 - 20c on 15c sky blue "horseshoe" overprint 3rd type, canceled with dotted numeral "201" of the "AMBULANTE CUNEO-TORINO (1) 24 MAR 67" on large part of letter "con campioni di nessun valore" (worthless samples). Rare, Cert. E.Diena (Sassone 25 - € 23.750:2 = € 11.875)
