FYI: 1878 was the end of the war between Russia and Ottoman empire ending in the Treaty of San Stefano, followed by the Congress of Berlin, with an enormous impact on the Balkans : the creation of several nations, annexation of Bosnia
https://en.wikipedia.org/wiki/Congress_of_Berlin
and prelude to the Balkan wars
https://en.wikipedia.org/wiki/Balkan_Wars
and WWI
as for the decoration on the blade and grip/hilt of the long yataghan, this is not as refined and detailed as the Ottoman ones from the Balkans...see pics
yet the "simplicity" and floral decoration reminds me a little of 3 knives I have from Serbia, which were made just after the war between the Principality of Serbia and the Ottoman Empire. In conjunction with the Principality of Montenegro.
https://en.wikipedia.org/wiki/Serbia...6%E2%80%931878) to see this you need to click on the link as shown in the last pic
The 3 knives have a steel blade but copper hilt and scabbard with nice but simple similar floral decoration, but the long yataghan as such I have never seen before....