Hello Jean,
Sorry for the brisk comment. 

 A search on the main forum will yield a bunch of threads covering the identification of horn.
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				Could you please show us a hilt made from white or green buffalo horn and having a similar color to the one shown by Gustav?
			
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 Here some examples from albino water buffalo:
 
 
 
 
 
(The greenish variants tend to be a bit darker, of course.)
Regards,
Kai