As far as I understand the turtle mark is a well known mark from as  far back as the early 19thc possibly a bit before, and the swords shown  in the last pics by Detlef are both later 19thc productions, and  the silver one is not from Laos its a typical Lanna Thai sword in Lanna  Thai silver dress - mounts from north Siam - Thailand.
		 
		
		
		
		
		
		
		
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