Los 6751
"56" postage due handstamp and the unusual handstamp "Fr.p.s." (France per sack) on unpaid letter Postmarked Dunkerque October 2nd 1868 and sent to Gefle, Sweden; the "Fr.p.s." was used only for a fortnight per year between 1868-1874 in several cities to mark letters from France for statistical reasons.
