Just looked it up in the book Deutsche Soldaten.  There is a very similar looking piece on page 263 top right side.  The description is saying its a tin for containing a soldiers toilitry items.  No measurements were given but there is a tooth brush in it sitting corner to corner so that should be close to the measurments you posted. 
 
Can't help with the stampings.
		 
		
		
		
		
		
		
			
				__________________ 
				Jordan Baker 
RHLI Museum, 
Otter LRC 
C15A-Wire3, 1944 
Willys MB, 1942 
10cwt Canadian trailer
			 
		
		
		
		
		
	
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