cover 40p. ultramarine, in a mixed franking with ordinary paper 20p. rose-carmine on 1869 (13 March) entire letter registered to Belgrade (15.3 arrival), both tied by framed "NAPLACENO" h.s. in blue and showing matching "KNJAZEVAC" despatch c.d.s. adjacent; light horizontal filing fold, well clear of adhesives. Lovely quality. Ex Verner. M.6x, 5y. Photo