One of the nicest features of Bhutanese swords, in my opinion, is the hairpin folding pattern in the blades.  Such a pattern is faintly visible in yours under the patina and rust.  If you are not averse to restoration (versus conservation), you might want to have it polished a bit and etched to bring out the pattern.
		 
		
		
		
		
		
		
		
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