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. Also, the only recorded Swedish mail to the Kingdom of Holland as French client state of the French Empire. Ex. Dr D. Halpern.
