I'm excited that this will be in my hands shortly. Its from the Canadian branch of Rubberset back in the day.
Really interesting find and it should give some insight on how they sorted & graded hair back in the day. I wonder how that ox ear hair compares to silvertip
Interesting... it looks like Ox hair is used a lot for paint brushes. Quoting from dickblick.com: The best quality comes from the ears of cattle or oxen. The Ox Hair has a very strong body with silken texture, is very resilient, has good "snap", but lacks a fine tip. Therefore, it is most useful in medium gradewash brushes, or flat shaped brushes. Frequently, ox hair is blended with other natural hair to increase the resiliency of a brush.
Last time I visited my Texan aunt's ranch I gathered horse tail hair. I wonder how the cows will feel about getting an ear hair trim...