Tatyana, it is wonderful to see you posting here again ! It seems like a very long time. A very attractive piece you have here, and the hilt is most interesting with the studded nail effect, reminds me of the Indian armour 'coat of a thousand nails'.
While I agree with the assessments toward the kukri genre, and that this does seem a hybrid form of weapon, I cannot help thinking of the variants of short swords that were seen in research years ago on what was then termed a Kurdish/Armenian yataghan. These were later termed 'Black Sea Knives' and were typically seen with horned pommel, the blade of more dramatic recurve and needle pointed much as the flyssa and Tatar ordynka's.
Later Ariel discovered these were actually termed 'Laz Bichagi' and from Ottoman regions in the mid to latter 19th century.
In the 1941 article, "Development of the Shashka" by Triikman & Jacobsen published in Copenhagen, there are a number of these recurved weapons illustrated as recurved 'yataghan' type swords, some with the horned pommel, some with standard hilt forms,but the recurve of the blade was distinct, and it seems the fullering was somewhat similar on some.
These were apparantly included in the work of a Hungarian author in an 1898 (?) narrative in which he described these groupings of 'Trancaucasian' swords using the term 'kardok' or something to that effect.
It has been years since I have seen this material, and I will try to see if I can retrace, but the images are somewhat vaguely seen in memory.
I cannot be certain, but even that fishtail pommel may have been on one.
I'll try to find the notes or info, and hopefully they 'made the cut' when we loaded into the bookmobile
In any case, I think this may possibly be one of this type of quite rarely found Transcaucasian weapons.
All the best,
Jim