I am unsure about fixing crack 
If mine I would leave alone,  
if I had to do a repair as in it is likely to break apart if it was picked up roughly  I would use silver solder rather than braze as it is easier to work with and will tarnish to look less obtrusive 
Lovely item though 
Well done 
 
Ken
		 
		
		
		
		
		
		
		
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