Peter Tuite 
US Naval Officers: Their Swords and Dirks 
ISBN-10: 1931464162 
ISBN-13: 978-1931464161 
 
In this later treatise, Tuite lists both brass and unmarked silver examples as synonymous and likely American made.  The dates range from the first two decades of the 19th century.  He shows both brass and silver examples with engraved scabbards and both types of pommels but none in that series of plates with mother of pearl. 
 
Cheers 
GC
		 
		
		
		
		
		
		
		
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