I would assume the Revolutionary War era blanket held by the Museum of the Fur Trade would probably be the most valuable point blanket. If the specific blanket can be proven to have been the property of a certain famous person, then that would have great value as well.
Harold Tichenor wrote and researched The Blanket: An Illustrated History of the Hudsons Bay Point Blanket.
In addition I did a great deal of reading, including numerous copies of The Beaver and the Journal of the Museum of the Fur Trade as well as correspondence with mills in England.
Very old blankets would obviously be the most valuable.
The original blankets incorporated three, four or five black stripes in the design, which indicated the value of the blanket.
Colors and variations of the original striped theme have been adapted to reflect distinguishing characteristics of each park and blanket in the collection.