This is a Bulldog Cases Belt Holster known as the Extreme, model FSN-15.
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 1911 style autos with up to a 5 barrel