1859 10c yellow, horizontal tete-beche pair, unused with full original gum, margins all around, h.r., excellent color, fresh and v.f., with 2002 Alex Rendon certificate. Only a few tete-beche pairs are known in sound condition (Cat No. 11a) (Image)

Est.US$5,000

1863 50c red, error of color (from the stone of 20c), unused without gum, full margins all around showing parts of the frame line on all four sides, beautiful color, fresh and v.f., with a tiny pinhole below "E" of "DE", mentioned for the sake of accuracy, signed Herbert Bloch, with 2001 Alex Rendon certificate. Only a few unused examples are known to exist (Cat No. 26b) (Image)

Est.US$7,500