If we are sill talking about a flissa dagger marked “Napoli”,  there is no need to postulate Ottoman or Greek roots. 
There was an old Neapolitan cutler  dynasty named Labruna.  In the mid- 19 century  Giuseppe Labruna produced high end regulation swords for the military, but his forte was Ottoman weapons. He even  made yataghans for Austro-Hungarian Croat Pandours. Thus, a flissa would not be a surprise. My bet is that if this flissa dagger could be carefully examined, there might be even his stamp. His descendants continued into the 20 century, but this is too new for me and I do not know the details about them.
		 
		
		
		
		
		
		
		
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