It looks to me like 3 different revolvers. The revolver in the top 2 is a S&W, by the looks of the cylinder release. I can't decide if it's a 4" 686 .357magnum or a 5" 625 .45acp.
Given the shape and position of the ejector rod, I'd say the revolver in the 3rd photo is some kind of single action revolver.
The revolver in the last photo may be a Colt or a S&W. I always look at the cylinder release, but I can't tell from that photo. If it's a Smith, it could be Model 10 .38spl. Others could be more help.