Richeson Squirrel Classic Mop Brushes
If you're old enough, you will remember this brush from before World War II. Made of Pure Black Kazan Squirrel hair, it has the shape of a large round brush when wet. Originally, these brushes were made with quills of large sea birds for ferrules. Today they are bound with plastic and wire. The brush is a real treat to use.
The pictures below are offered as shape references. They are not actual size.