Valley of Mexico, Toltec C.100 BC-800 AD. 3/4" finely flaked obsidian. Triangular with notched base for mounting. The surface with slight soil adhesion from burial, but no damage whatever which is very rare. Toltec history is still the subject of some controversy among experts, so this item can most conservatively be described as "Valley of Mexico, 1000 BC - 800 AD". Fine form.