Wow, can't believe I've missed this post over the years...
I've attached the pictures pointed out by Ariel. This is a very strange piece. It seems to be a knife for domestic use with a cast, integral bolster and handle.
The pommel is very similar to that of the flyssa, but it also closely follows the outline of pommels
seen on the karabela.
The blade is inscribed "Vivat Maria Theresia" and the museum label suggests 1740-1780. What does the Cyrillic say? It coincides with the reign of Queen Maria Theresa.
This brings a lot of question about the iconic flyssa pommel design.
Emanuel