Hello Robert, 
 
what a beautiful transforming. Like said before, I am also never have seen this way of engraving before by a gunong blade. The handle style is an early one, I would guess also by the ferrule style that this gunong is from 1900-1920. May I ask you how you have closed the splits in the wooden handle? 
 
Regards, 
Detlef
		 
		
		
		
		
		
		
		
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