I am not a collector or enthusiast of Moro swords, so please give me a slack. 
 The undulating snake with transverse lines reminds me of Persian motives.  
 Going totally on a limb, is it possible that the dog is a local "transcription" of a famous Passau mark? Many local blades from the Caucasus ("ters maimal")to E.Africa  carried fake Passau marks as a testament to their quality. 
Would it be possible that the maker of this Barong just went overboard and marked his creation with marks from  all the best swords he knew: Passau, Persian and Zulfikar just as an equivalent of "Wow, look at it!" 
 And indeed, it is a very, very well made blade, something to be proud of.
		 
		
		
		
		
		
		
		
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