Pof.57D, Rectangle 2h brown-red with rare line perforation 12½ : 11½, blue Opt; superb piece mint never hinged, certificate and exp. Vrba, in this quality rare occurrence!
Pof.58D, Rectangle 5h green as blk-of-4 with rare mixed perforation line perforation 12½ : 11½; overprint types III+I+II+I; mint never hinged, L the bottom stamp. small production gum flaw, Vrba certificate, exp. by Gilbert and Karasek and Vrba, multiples with this perf are exceedingly rare, skvělá item to every specialized collection!