My guess is that these impressions have no particular meaning, though possibly they were inspired by having seen Roman numerals, perhaps on a European clock for instance. Their production would only require two or three simple metal punches. 
 
I have noticed similar phenomena on Oceanic wooden clubs, which have incised on them a meaningless jumble of letters, probably copied from a book or newspaper. 
 
But an interesting sword, nonetheless.
		 
		
		
		
		
		
		
		
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