The tricky thing about Moroccan koummiya/jambiyas is that Moroccan merchants have been selling them to tourists for a VERY long time.  While they may not have used the same terminology, I don't doubt that there were merchant stalls selling souvenirs to Viking warriors on their way to serve as guards on the Byzantine court at Constantinople. 
 
The rule of thumb I try and use is, can I imagine using a particular example to defend myself in a street brawl?  It doesn't matter how pretty it is, if it has a cheap blade and flimsy construction, it's a tourist piece and not the 'real thing'.  Of the ones I see listed for sale on ebay, I'd say at least 95% are souvenir pieces. 
 
Fenris
		 
		
		
		
		
		
		
		
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