Gentlemen, I'm very happy with your input. 
 
Nechesh, I could remove the hilt and made some pictures of the tang. During taking the pictures I noticed a very small stamp on the blade, hardly visible, but the pictures don't lie. It is very hard to see what the mark is even under a magnifying glass. I asked my daughter to look for me and she saw something like a N and a 4 or a triangle. On the picture I have a better image and I see something as PM or PN but it is very small and hardly to see with naked eyes.  
Ki Jayamalelo showed a link of bayonets with a triangular one. If you look at such a bayonet it is attached with a round elbowformed tube to the socket. 
The tang of my blade is square and doesn't show signs of reattachement to the blade. 
 
As far as I know those reattachements or welding spurs are easily to discover. I've seen often reattached peksi's to keris. The place were the peksi is reattached is always thicker and visible. 
 
I would like to hear your comments on these facts. 
Alan, I hope you will react as well.
		 
		
		
		
			
		
		
		
		
		
		
		
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