The inclusion at the bottom is open acting as a sound hole.  Pot made from madrone Burl. 3.25" glass/glass.  walnut/bamboo striker.   This call is still available in the classifieds.  
(http://i1174.photobucket.com/albums/r612/rhoward327/20160327_211155_zpsaty4mgvh.jpg) (http://s1174.photobucket.com/user/rhoward327/media/20160327_211155_zpsaty4mgvh.jpg.html)
https://m.youtube.com/watch?v=5Rw0MYS-lpU
			
			
			
				Good looking call Rick 
			
			
			
				Thank you, Mike.  
			
			
			
				Very nice
			
			
			
				Thank you, terry.  
			
			
			
				Nice work!! That's a beauty for sure.