http://www.oriental-arms.com/photos.php?id=758
If you look at the second picture from the bottom, these are the very same words(only excluding the last word) that your yatagan has. I still believe this is not turkish, but who knows.
When I was looking at several different yatagans, a question occured to me that why some yatagan scabbards had a fish-head like bottoms and others don't? what was the significance?