United States 1867 15c black Lincoln New Orleans to Bordeaux France Folded Cover w/Cert

Folded cover, franked with 15c black Lincoln (Sc. 77), tied by New Orleans c.d.s., to Bordeaux, France, endorsed "per Steamer" and struck on front with red NEW YORK packet d/s (Apr 11) and red ETATS-UNIS SERV. AM. CALAIS entry mark (23 Avril), PARIS A BORDEAUX (23 Avril) TPO transit and further partial French c.d.s. backstamps, a few small edge tears and some toning to stamp, still a scarce and desirable franking; with 1934 (!) Royal Philatelic Society London certificate.