Jens, 
First, thank you for sharing your research and creating a separate post with more information. Good idea and very well done too. 
 
Stefan, 
welcome to the Forum. Below I post more pictures of the blade. It is still in a sad shape, but it's much better than it was before:-) 
I suspect this blade is a regular/standard tulwar blade, UNLESS the rare combination of two stamps makes it special:-)
		 
		
		
		
			
		
		
		
		
		
		
		
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