TT PK 6s 1960-61 RWANDA-BURUNDI 500 FRANCS SPECIMEN BLACK RHINO PMG 66 EPQ GEMTT PK 6s 1960 61 RWANDA BURUNDI 500 FRANCS SPECIMEN BLACK RHINO PMG 66 EPQ GEM 1960 61 500 Francs from Rwanda Burundi. Pk 6s and serial number 21. Specimen banknote graded 66 Exceptional Paper Quality Gem Uncirculated by PMG. Here is a very unique piece called the Black Rhino. Uniquely double marked canceled, but there are no cancelled cut outs in the paper. Also note is the 21st specimen printed highly colected and very affordable for one note