This is a Bulldog Cases Belt Holster known as the Extreme, model FSN-14.
The Extreme Pistol Holster with its durable nylon water resistant outer shell and top grade fused padding provides the ultimate fit" comfort and protection for you and your pistol.
Features:
Ambidextrous belt loop and metal clip
Soft, scratch resistant inner lining
Spine protector
Fits revolvers with 5-6.5 barrels, S&W K/L/N frame, Colt Anaconda, EAA Windicator