I just got the Sim Comfort volumes!!! and they are unbelievable! 
 
To answer some of my own questions in first browsing, 
it seems the double disc cutlass as a form may well have been created by Thomas Hollier, between 1716-1727 and was around variously through the century.  I did find an example by Thomas Gill from 1780-85,  
the blade was stamped on face, upper quadrant at forte, Tho. GILL 
 
Thomas Gill was registered c. 1774 as a steel worker toys, files, razord. 
About 1783 listed as sword maker, but it is suggested may have done so earlier due to the Revolutionary War.
		 
		
		
		
		
		
		
		
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