These are simple bone discs of varying sizes. They probably were locally made, and may have been covered in fabric with a string eye. Examples found in excavations at Fort Michilimackinac, Michigan date from 1750 to 1770. This type of button is the second most common found at Davidsonville.
Clothing, Fasteners, Bone
(L to R): 2004-666-53-16-2, 2004-666-53-16-3, 2005-602-7-16-2, 2005-602-28-16-1, 2005-602-7-16-1