unmounted mint BIAFRA: 1968-69 collection including 1968 ½d. to £1 set of 13 (3), 5/- and £1 with black overprint omitted, 1968 "FRIENDSHIP" overprint values (11, some with varities), 1968 "HELP BIAFRAN CHILDREN" overprints with varieties, 1969 Pope imperf. colour trials (12) and various miniature sheets (8); fine unmounted mint