Here are two antique brushes. I think they are horse hair. One is 12 by 4 1/2, next is 10 by 4 1/2.
Antique Horse Brush
Great old barber's neck brush, turned wood handle and horse hair.
Antique 19th Century Turned Wood Shaker Horse Hair Brush 10 Barber Neck
Set Vintage Shoe Shine Brush Set, Wood, Horse Hair, Vintage
Wood Handled Horse Hair Boot Brush / Vintage Rustic Tools
Vintage Wooden Utility Brushes, Horse Hair Brushes, Broom Brush
Coarse Mixed Horsehair Paint Brush With Bamboo Handle – Elizabeth
Vintage Antler Brass and Horse Hair Brush - Ruby Lane
2 OLD ANTIQUE PRIMITIVE SHAKER HORSE HAIR WHISK BROOM BRUSH WILLIS
Early 1900s Antique Utility Brush signed Adams (likely Adams Brush Co, Boston) measuring 11-1/4. Excellent condition with nicely turned handle.
Antique Horsehair Brush with Shaker Style Turned Wood Handle marked Adams