Hi Paolo! 
I think you're post got buried under the others and I didn't see it. Your example does look a lot like mine...it has the same floral decorations, and I think partly the same writing. From looking at the examples in old threads, I take it is says "al -karthoum" and a date, which in your case will also be around 1900 I think. So 1900 Karthoum, Sudan. 
 
Regards, 
Emanuel
		 
		
		
		
		
		
		
		
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