As William Sheldon eloquently put it in Penny Whimsy, Old copper, like beauty, appears to possess a certain intrinsic quality or charm... with] an almost living warmth and personality not encountered in any other metal.... You see rich shades of green, red, brown, yellow, and even deep ebony: together not elsewhere matched in nature save perhaps in autumn leaves.... Early coppers are rich in die varieties, cracked dies, imperfect and unusual planchets,...