Michael Barber, State Archaeologist with the Virginia Department of Historic Resources, highlights several artifacts in the state's collection and how archaeologists were able to discover their purpose.
I found a atlatl boatstone in north CA. It's oval bout 8" ,polished with notch / lash marks on both ends. I also found a plummet or charmstone last year.
the only problem i see with his atlatl with the banner stone is the hole looks much bigger on his. if the real ones were used like that they would have been on pretty flimsy throwers.