Great Britain 1850 1d red brown Plate 98 (Archer trial perforation), SG16bGreat Britain 1850 1d red brown Plate 98 (Archer trial perforation), SG16b. A pristine unmounted mint example with full original gum, lettered ND. A magnificent example of this rare perforation trial and of huge philatelic importance marking the invention of perforated stamps. Henry Archer was an Irish born businessman. He was the first to put forward the concept of having an easy method to separate stamps from the sheet. The first two types of