I have been involved, directly and indirectly, in a number of restorations some of which have included new trunnions and the guns that are subject of this post do not appear to have welded on trunnions. 
 
Below are photos: 
 
Showing a gun with its original trunnions - virtually everything about which appears identical to the subject guns. 
 
Showing a gun having new trunnions welded on - evidence of such a weld & its 'clean up' are virtually impossible to disguise against close inspection. 
 
Showing a completed gun that has new trunnions & chase. At a distance the trunnions appear okay while the new chase is easily detected due to its lack of surface corrosion.
		 
		
		
		
			
		
		
		
		
		
		
		
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