OTYIMBINGUE, 20 Pfennig ultramarine horizontal pair on forerunner letter, correctly rated multiple franking on decorative preprinted envelope to Cape Town, perfect 6.1.91 strike, minimal brown toning at stamp tops, CAPE TOWN 23. JA. 91 arrival on reverse, very good condition, photo certificate Czimmek BPP (1999) "Letter in clean condition"