Skinner Inc. has an upcoming auction which contains a very interesting winter count on muslin, one I haven't seen before. I believe this to be a Hunkpapa count, but the keeper's name has unfortunately not been recorded.
Description by Skinner reads: Historic Sioux Muslin Winter Count, c. 1930, the highly detailed painting is a later copy, probably depicting the years 1823-1908, based on number 11, "The Year the Stars Fell," eighty-five depictions of important events laid out in five vertical sections, number 59 probably portrays Hunkpapa chief Sitting Bull and his people being taken to their reservation on a steamboat, 115 x 36 in.
The image of the total muslin is in low resolution, but I have taken the higher resolution close ups and created a single hires image to share. I haven't tried to match the numbers with dates yet, but maybe we could work on this together in this thread?