Arabs very often used high-mirror polish. I have a couple of  those, with pretty worn handles, but with blades one could  use as a shaving mirror. 
 Take it to a local jeweler with  a good machine: they can detect chrome or nickel in 5 seconds flat. 
 If it is in the original Arab polish, I would try to preserve it as is: oil only. 
 
 Excellent find!!!
		 
		
		
		
		
		
		
		
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