This pristine armour looks extremely close to mithril armour but upon close inspection its just an imitation 

Plate consists of shaped, interlocking metal plates to cover the entire body. A suit of plate includes gauntlets, heavy leather boots, a visored helmet, and thick layers of padding underneath the armor. Buckles and straps distribute the weight over the body.

Notes: Bonus: Armor Class, Advantage: Saving Throws, Resistance: Force, Str. 15 Required, Stealth Disadvantage