I like the Bianchi 5BHL belt holster. They come in left and right hand versions. Cheaper than Dirt had them in stock a couple of weeks ago as I just bought a new one (right hand). You will have it in a week.
Dillon Precision catalog shows a holster made just for the S&W mountain gun...find a copy and you will see it about halfway through. It looks like fine leather to me. Kramer I think.