Thank you David, Maisey and Jean for your concern and precious information. 
I am sending other 4 pictures that might help for identification of the material, marine ivory (dugong tusk or whale tusk or other marine animal..) or elephant ivory). 
I could not see Schreger lines on the pieces but it may happen because the piece is old and has a very dark patina.  
Other 4 pictures are being sent. 
Thanks again. 
Cheers !!
		 
		
		
		
			
		
		
		
		
		
		
		
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