This looks like good 19th/early 20th century steel.  I am guessing that is has a good degree of flex.  Judging by the pretty and fairly lightweight handle also the shape of the blade, it appears to me to be a reused cake knife.  I do not mean a dainty thing, no something much more substantial.  A tool for large special cake work, try spreading a couple of pounds of icing on a huge cake with something dainty, would be hopeless.  Very interesting.
		 
		
		
		
		
		
		
		
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