cover 9Kr. lightish green, a block of four with good margins on reverse of small 1855 envelope (flap missing) to "La Princesse de Hohenlohe", Blankenburg, Belgium, and bearing, on obverse, two single examples (slightly overlapping) all cancelled by cogwheel "305" at Schillingsfürst, showing half circle origin d.s. (9/8) on face. Fine and a great rarity. Schmitt certificate. M.5c. Photo in colour