1920-21 4m on 2fr, block of four, upper left stamp type II, others type I, gum adhesions, also 4m on 2fr horizontal pair, types I+II, used on registered cover (slightly reduced at bottom) to Brussels, also Air Post, vertical pair Types I+II, l.h., fine-v.f. (Cat No. 31,31a,C5,5a) (Image)

Est.US$250