Wowza Rob.  
I would really like to see what the barrel thickness of a 6 frame 10 ga looks like from the breech and/or the muzzle. It must be extremely thick if it weighs 15+ lbs. 
I also suggest you double check your serial number, grade stamping if there is one.  
Sorry I am no help when it comes to valuing this configuration. 
Best, 
Erick
		 
		
		
		
		
		
		
		
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