Vintage Leather Horse Bridle, likely a black leather snaffle bridle or a similar variation designed for English riding disciplines. This specific piece of equestrian equipment is used to direct a horse and includes several key components: 
 
Key Components Visible
Headpiece/Poll Strap: The top part that sits behind the horse's ears.
Browband: The strap that runs across the horse's forehead.
Cheekpieces: The straps that run down the side of the horse's face to attach to the bit.
Throatlatch: The strap that goes under the horse's throat to keep the bridle in place.
 
It has a strong horse scent.