thks for your opinion; but take a closer look at the drilled hole; tan just shows under the green; sun damage doesn't bleed through and into an object ; and definitely not on the inside core of something. if this is a manufactures sample chip as you suggest; the two tone would make sense. sun damage or whats commonly called "a changeling" in the postage stamp world doesn't hold up here; unless you can explain the sharp color difference at the top of the hole on the green side as sun damage.