YES & No. Luster is the reflection of light from a surface and depending on the surface, angle, and intensity of the light it changes. Original Mint luster has several specific looks based on the way it reflects light, the way it was struck, the condition and composition of the planchet and the condition of the dies. Therefore Proofs are subject to the same things. What page of the book so I can read it. You see, some folks think the word "luster" only apples to frosty coins rather than the quality of the reflection.