Papua New Guinea

PAPUA NEW GUINEA (L.188)
1989 Stamp Duty revenue surcharge10t on 40t (large letters) on shell postage stamp, marginal block of twenty showing Mardon imprint at top and at bottom, and includes the two stamps with variety two dots below thick bar (Bft 101a, row 1 pos 2, and Bft 10ab row 3 pos 2, these occur on a few sheets only, new discovery), all unmounted mint