This is a Bianchi Holster known as the 7001, model 17745.
This thumbsnap holster is suitable for outdoor and concealment applications. Its trilaminate construction of a closed-cell foam center" poly-knit inner lining and ballistic weave finish offers sturdy protection for the handgun. The holster rides at a 10-13 degree forward angle and the thumb break strap wraps cleanly over hammer. The belt slides through the Quick-Slide 1.75 in. (45 mm) belt loop.
Features:
Fits medium/large revolver with 6 barrel;Right hand