Hi Gene, 
           The 1845~1854 dates can be a wee bit fluid as although the patterns were introduced in those dates the practicalities meant that the pattern cutoffs were not absolute. If that is a brass scabbard I have always thought that it indicated it belonged to an officer of field rank i.e. Major and above. Nice sword. 
My Regards, 
Norman.
		 
		
		
		
		
		
		
		
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