Sweden. Foreign-related cover. Netherlands. Letter dated in Stockholm on 9.5.1810 sent partly prepaid to Amsterdam. Postmarks 9.MAI.1810 (ArGe B.51) and SUEDE / P.. HAMBOURG. R4, used only during the period April–October 1810 (VdL, rarity 6). Allegedly only two recorded. Ex. Dr D. Halpern.
