Early Acheulian & Developed OldowanB / t)oldef-hrbiffig67
Oblong lava pick. Site EF-HR, Upper Middle Bed II, Olduvai Gorge (c. 1.3 MYA).
The mirror symmetries in this piece appear to be a bit askew.
Photo © Leakey, M. (1971). Olduvai Gorge, Vol. 3. Cambridge: At the University Press: fig. 67. (yellow highlight added)