Jens, 
 You may have a good point. 
 Egerton writes about Indian/Persian enameling as being "champleve: and specifically mentions Sindh as the area producing enameling with a "blue with rich flowers" pattern. 
 Uzbek/Tajik origin was  just a feeling. They made very similar champleve.
		 
		
		
		
		
		
		
		
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