1880. Large part of registered cover (faults, stains), addressed to the Ministry of Education, Belgrade franekd 40 p pale mauve, perf 12 of 1876 Prince Milan Forth Printing an d20 p grey-blue, perf 12 of 1878 Prince Milan Fifth Printing, tied by boxed ”PREPORUCHENO”, the 20p value additionally tied by ornamented ”ALEXSINAC 29/5” at reverse ”BEOGRAD 31/V/80” arrival mark. The Prince Milan issue stamps were valid until 31 Oct 1880. Very late usage Certificate Kardosch SBPV.