It looks that my friend misspleled the family name... it is not Bahtiany but rather Batthyány.
From Wikipedia: Batthyány is the name of an old distinguished Hungarian Magnate family.They were first mentioned in documents in 1398 and had their ancestral seat in Güssing in the Austrian region Burgenland since 1522. In 1570, Balthasar Batthyány transformed the seat of the family, Güssing, into the center of protestantism in the region. His descendant however, Adam Batthyány (* 1610, † 1659) was catholic and founded a Franciscan monastery in Güssing (in the south of the present-day Burgenland). Lajos Batthyány became the first Prime Minister of Hungary during the revolution of 1848 and was executed in Pest in 1849. After 1945 the Batthyány family was largely expropriated in the then socialist countries, although they kept some important property in the Burgenland, Austria. They had also properties near the city of Maribor (Slovenia).
And there is their coat of arms... It is a swan
looks my friend was right attributing that sword to that precise noble family and the colour of the jewels as Tim stated indeed represents the hungarian flag. I guess that it was confiscated and kept some 60 years ago by some yugoslav communist officer or aktivist.
It seems that the guy on the photo below is wearing a verry similar collar, and BTW that
is not a knightly order collar, it is a mantle bearer.
What about the age? I would think about 1849 looking at the nationalistic hungarian colors on it
The price is faaar above my current finance situation. If anybody is interested I can arrange a meeting.