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					Originally Posted by Iain
					
				 
				Probably way off with this, but if this is a Russian imperial eagle, didn't Peter the Great decree that imperator should be used instead of tsar? Not sure if they used the IR abbreviation, but the 18th century would be a fit for the style of the dagger? 
			
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 I'd love to find some way to date this knife to the 18th century. I've been thinking mid 19th century. Would love to hear what others think and find a similar example that can be dated.