This is my Coonan Classic Shoulder holster from Black Hills Leather. He does really good work. http://www.bhlstore.com/shop/category.asp?catid=208
It holds 4 extra mags (which help balance out the gun) I had the Initals "357" engraved on the holster as well to match the Coonan.
I wear this holster a great deal. Not every day but more than a few times a week. In addition I have a 357 magnum J-frame and a NAA mini revolver on me at all times.
The picture Quality is poor because I have a cheep flip phone and the angle makes the mags look odd but you get the idea.