Hi Leif, 
 
agree with nearly all your observations but I think that the scabbard is much younger as the tabak.  
The knife byself I would place between the 1920s until 1940s but the scabbard looks much younger. Courious to see your pictures. 
 
Regards, 
Detlef
		 
		
		
		
		
		
		
		
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