cover 15pa. orange horizontal pair and 50pa. deep green (all perf. 9½x12) affixed to 1876 (7 Dec.) envelope (a little flimsy) registered to France (12.12 arrival) and tied by two oily strikes of bilingual "BEOGRAD/BELGRADE" c.d.s.; envelope with a few faults including creasing, though mainly confined to reverse. One of the few recorded frankings extant. M.13/18IC. Photo