1891 cover to London with a French 25c cancelled ZANZIBAR 3 AVRIL 91. A La Reunion a Marseille L. V. No. 2, 3 AVRIL 81 datestamp is on the front of the cover, on the back is a London AP 21 91 arrival cancel. An unusual cover going through the French P. O. in Zanzibar to London. Most mail to England would have gone through the British Post Office there.