Judging quality
An etched slice showing a clear Widmanstatten lattice is the proof of authenticity — the pattern cannot be faked, as it requires cooling rates of a few degrees per million years.
Meteorite
Fragments of the shattered cores of early planetesimals: solid iron-nickel that cooled over millions of years, producing the interlocking Widmanstatten pattern revealed by etching.

An etched slice showing a clear Widmanstatten lattice is the proof of authenticity — the pattern cannot be faked, as it requires cooling rates of a few degrees per million years.
Rusts readily. Keep bone dry, handle with clean hands, and oil occasionally if displayed.
Gibeon iron was worked into tools and weapons by the Nama people of Namibia long before European documentation.
Cultural history, recorded as tradition rather than as medical or scientific claim.
See it in person
Both rooms are open six days a week, and there is always someone happy to pull pieces out of the case so you can compare them under the light.