Cape of Good Hope 1886 BONC 524 Proving Cover to Paris

1886 PROVING COVER BONC 524 ALIWAL NORTH: Envelope endorsed "Per Mail Steamer" to Paris franked Hope Seated 6d & 1d x2 tied by three neat strikes of the BONC 524 with proving despatch cds AU 8 alongside. Front shows 2½d accountancy value in red and arrival cds 4 SEPT. On reverse Cape Town & London (in red) transit marks and additional Paris cds. VF.