Entire letter posted 7 Mar. 1871 from Syros to Trieste, franked 40l. with C.F 40 on 20 (Hellas 24Nf), 5l. and 10l. with C.F. showing 0 inverted (and widely spaced) (Hellas 26Nb). The only known cover with 2 control figure errors and the 2nd known cover with the 40 on 20 error. (The first one, from the Mattheos collection was sold 9000+ Sfr, in Feldmann auction).