It's dyed boar, and one of the best boar brushes ever!!! They were made for years and there's no way to pin it down unfortunately, they weren't really meant to last forever, they were sort of disposable. The Ever~Ready brand which was part of the American Safety Razor Company made brushes from 1915 to the early 1990s, and that brush was available for most of, if not all of, that time period. You can still find them new in the box occasionally, and for very reasonable prices.