I'm told that these pearls were purchased in Tokyo in the late 1966s and are Mikimoto. I searched but can't find a clasp quite like this. It says sterling on the side.  I also have not seen this combination of white and black as a double strand. Any help much appreciated. Thank you.
		
		
	
	
		 
	
		 
	
		 
	
				
			 
	 
			 
			 
 
		 
 
		 
 
		 
 
		 
					
				 
						
					