Hello Rob, 
 
Like I stated before, I am really not an expert when it comes to koummyas. I've handled some very nice and clearly very old/antique examples and all these examples had loops instead of rivets like the example in question or the one I posted, these loops were partly extremely worn, a few so much that it was worn through or the metal really thin already. Clearly from long time use and over a long time daily worn. 
But I think that the riveted version never worked for daily use, I think that they like I stated before are pure presentation daggers, given as presents to visitors who rarely will wear such a dagger or in the case it was the dagger of a Moroccan, only by special events. 
On the other hand, with such a koummya in hand, I can assure you that these riveted rings seem much stronger to my eyes than I thought!  
And Eric stated the early 20th century, which is antique without doubt. 
 
Regards, 
Detlef
		 
		
		
		
		
		
		
		
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