Henk , the only thing I would check is if these blades have been varnished or lacquered ; if they have then I would think that removing the old applied finish would be acceptable . 
Then I would apply Rennaisance Wax as a substitute . 
 
As you probably know it was not unusual for collectors of earlier times to varnish or lacquer their pieces to prevent rusting . 
 
They are all beauties . 
 
IMO sharpening shows an active career for the sword .
		 
		
		
		
		
		
		
		
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