Los 300
10 c. black, 2 horizontal strips of 4, one clear in one place, otherwise both with good to wide margins, tied by circle of 9 bars to letter (partly folded up, top and bottom flaps missing) from "LUXEMBOURG 17 DEC. 55" to London with transit and arrival marks on front and reverse; 2 stamps of the franking with vertical crease, where affixed around the edge of the cover; a remarkable and rare double rate franking to England; certificates Goebel (2006) and Scheller (2009)
