I found these little old squirrel hair brushes at an antique shop in New Hampshire and just thought they were great looking. Apparently, these are especially good for sign painting and lettering, and these three appear to be in good condition to be used for such, but would also I think just be great additions to a collection of interesting brushes.
Sold as a set of three. The longest measures 4 3/4" long; the shortest 4 1/8" long. One is marked 03, the others appear unmarked.