I believe the shorter militia swords with leather scabbards are generally for NCOs. Hotspur knows these very well, so perhaps he can address them. 
 
The officer's sword I posted has a 31 inch blade that is 1 inch wide at the ricasso. The narrow central fuller is about 12 inches long. 
 
Both this example and another "full size" US militia officer's sword in my collection have all-metal scabbards. 
 
Here's an ACW-vintage shot of Lt. Col. Charles Norton wearing the same sword.
		 
		
		
		
			
		
		
		
		
		
		
		
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