Stanger (now KwaDukuza) South Africa 1987 06 30 tieing 16c City Hall definitive on airmail envelope with red boxed South African  "Insufficiently Prepaid For Transmission by Airmail..." and New York, NY (or New Jersey) purple, Foriegn Mail Center Postage Due 59 Cents handstamp, which seems to have been for airmail rate

Please see scans