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					Originally Posted by spiral
					
				 Personly I think that implys later modification than 1897.  Aluminium was about the price of  24c gold at that time I understand. So if used would be with rather more finesse I think?
 
 Spiral
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 Interesting price comparison Spiral, I never knew.  
As these rovers of the sea took what they did, not buy it, I would consider such a piece of aluminium to be period correct.  It is well documented that pirates did destroy many fine pieces to equally share the weight of the booty , even coins where cut to pieces, with larger shares going to captains and others.  This rough filed piece could well have been one of these pieces.
Gav