There is no definitive answer, but you could look for an antique shop that specializes in shaving equipment. You might also try searching online auction sites or classified ads.
The quality of lather that a synthetic can produce is very fine and rich, giving that smooth and easy feel while shaving. Synthetic brushes do a good job in any environment with less care.
Are Badger Brushes Better Than Synthetic?
The quality of lather that a synthetic can produce is very fine and rich, giving that smooth and easy feel while shaving. They last longer. Synthetic brushes do a good job in any environment with less care. A badger brush is easy to give way to damage. 
What Is The Softest Shaving Brush?
The soft grade of badger is called silvertip badger. Many shaving enthusiasts use silvertip. Many brands costing 4 to 5 times more money are inferior to theparker silvertip brushes. The silvertips are best for people with sensitive skin. 
What Is Pure Badger Hair?
Pure badger varies in color from dark tan to black, and is usually coarse in texture than higher grade hair. The tips of the brushes are trimmed to form the final shape of the brush loft. 
Are Synthetic Shave Brushes Better?
Synthetic shaving brushes have soft nylon bristles which make them less likely to cause skin irritation. Some people may suffer from irritation with their natural hair. Those with sensitive skin should use synthetic shaving brushes. 
Are Badger Hair Brushes Cruel?
The harvesting of badger hair for shaving brushes is considered cruel. Some companies that claim to be cruelty-free put out conflicting information about their practices. It is common for these companies to keep their suppliers under wraps. 
Why Do They Use Badger Hair For Shaving Brushes?
The benefits of using a badger hair shaving brush are that it works your preferred shaving cream or soap into a rich lather and holds heat superbly during the shave. Badger shaving brushes can act as a mild exfoliator due to the slightly coarse nature of badger hair. 
What Hair Are Shaving Brushes Made From?
There are bristles. Badger hair is usually used to make shaving brushes. There are more natural and synthetic bristles to choose from. Most shaving brushes are made from the hair of animals. 
Frank Harmenstein is the lead editor of the grooming website Cut Throat Straight Razor, and has over 15 years of experience in the industry. He’s personally tested and reviewed over 200 different straight razors, and has written countless articles on the subject.