This type of Rencong i found on the museum collection of the Met collection where it had the following description: 
 
Dagger (Bade-bade) with Sheath 
Sumatran, possibly Acheen 
 
16th–19th century 
 
This one also has a sleeve different than the crowned versions.  
 
And Detlef, your rencong with akha bahar is also a beautiful example.
		 
		
		
		
			
		
		
		
		
		
		
		
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