Question: The London Hammer is considered what type of artifact?
Sentence (from "Out-of-place artifact"): An out-of-place artifact (OOPArt) is an artifact of historical, archaeological, or paleontological interest found in an unusual context, that challenges conventional historical chronology by being "too advanced" for the level of civilization that existed at the time, or showing "human presence" before humans were known to exist.
Relevant evidence: Yes