Commercial cover with fine strike of oval SEPI POSTAL AGENCY SANTA ISABEL IS B.S.I.P. 'Crown' originating cancel dated 17 JAN 1970 in blue on front, franked with 1968 1c turquoise blue, black & brown and 6c 'Gold lip shell diving' QE2 issue (SG 166 & 170) tied in transit by HONIARA cds. Addressed to SOUTH AFRICA. This is the earliest recorded date for this Postal Agency.