90¢ Ultramarine lower right corner block of four showing the constant 'square period' variety on the lower right stamp, Bileski guarantee on reverse, VF NH

Cat. Value 84 $

90¢ Ultramarine mint corner block of four, the lower right stamp has the scarce 'large square period after second f' variety, a normal hinged blocks lists at US$84.00+, F-VF NH (Image)

Estimate 75 $

60¢ on 90¢ and 1.50fr on 90¢ Ultramarine, a nice mint block of four of each, VF NH

Cat. Value 124 $