Thank you so much for posting these! 
Well observed on the solid backstrap terminus.  
I think what we see here is the transitory situation, and all great examples of that.   
 
The one from Wilkinson-Latham (45) is indeed identified as c.1780 dragoon officers sword and appears in Blair as noted. I recall getting this around '78, and it had a brass hilt. I was surprised in seeing other examples being steel rather than brass. There never seemed to be a consensus on what these were...in a rather bizarre note Stone (1934) has one of these among several other swords and listed as Italian! ? 
I no longer have it, wish I still did.
		 
		
		
		
		
		
		
		
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