A.L. 666-1 was discovered in 1994 in Hadar, Ethiopia. It dates to ~2·33 MYA and has been attributed to Homo habilis. A number of Oldowan flakes and choppers were found as well.
Kimbel et al 1996 Late Pliocene Homo and Oldowan Tools from the Hadar Formation (Kada Hadar Member), Ethiopia. Journal of Human Evolution 31: 549–561
Kimbel et al 1997 Systematic Assessment of a Maxilla of Homo From Hadar, Ethiopia. AJPA 103:235–262