mint block of four (positions 85-86, 95-96), orange red overprint, stage III (13.C), position 95 "Pamana" at right and both "Panamas" 1½mm below bar (13.7), position 96 left "Panama" touches bar and right "Panama" 1½mm below bar (13.10), tropicalized gum, otherwise very fine and scarce, 1991 Philatelic Foundation certificate