AzurePark:
The additional pictures are helpful and confirm an antique blade with evidence of old, stable, spidery areas of oxidation as well as some active rust. Your conservator needs to attend to the active rust and prevent it from corroding the sword further. Once the active rust is removed it should either be oiled frequently or treated with a silicone wax, such as Renaissance Wax--but I'm sure your folks know how to preserve these types of artifacts.
I don't see a hardened edge but that does not mean much on a blade of this age. Personally, I would not etch the blade to try to find a hardened edge--simply remove the active rust and conserve it.
Please post a notice here of when the exhibition will be open and where it will be held.
Ian.
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