The first one is made by S.D. Myres. It is called their Myres Barton Special. They were the first to use this ingenious styled holster. It has a reinforced rear flap can be tucked behind your belt, inside the waistband, or in the back pocket. Makes for a quick on/quick off situation. Most of these that I have seen are made for smaller guns like a snub nose revolver. This one is made for a 6 1/2 inch barreled S&W .44 magnum, so the weight of it might pull your pants down when you wear it. BTW, nobody that I know of knows who the Barton is that the holster is named after.
The second holster is also made by S.D. Myres. I think it is their model 999. I believe Myres called it their Ranger holster. We call it a "Jockstrap" patterned holster now. It is made for a 6 inch barreled S&W K frame revolver.
Attended the Mesa Gun Show this weekend picked up this floral carved holster made by Birds Saddlery, Mesa, Arizona back in the '50s. it was made for a 5 1/2" SAA. I had one of these before and moved it along to forum member turnerriver....