Apart from all the other associations of Sarajevo, we thought we would look up the bridge.  Wikipedia told us this:  “Latin Bridge (Serbo-Croatian: Latinska ćuprija/Латинска ћуприја, named Principov most/Принципов мост – “Princip’s Bridge” in Yugoslav era), is an Ottoman bridge over the river Miljacka … The northern end of the bridge was the site of the assassination of Archduke Franz Ferdinand of Austria by Gavrilo Princip in 1914, which became casus belli of World War I.”  As for the card, it was mailed in 1970 with two different stamps, mostly readable postmark, and staining along the upper reverse edge.  Just by the way, we went there and stood in that same spot but nobody shot at us.  Grade: 3