1870, Entrusted cover of the Armand Barbes, incomplete franking with Lauré Y&T n°31 40c cancelled black PD on envelope to St Petersburg (Russia) with handwritten mention by Ballon Monté, correspondence dated 29 September 1870 and arrival postmark on back dated 4 October (superb strike), unique item and probably the only entrusted cover to Russia, Behr certificate (2016), VG.