Missing Design Elements: The most direct effect is the absence of small, intricate design details. On heavily over polished dies, elements such as leaves, letters, or even facial features might be partially or completely missing.
Smooth Surfaces: Areas of the coin that should have fine textural details may appear unnaturally smooth or polished, giving the coin a washed-out look.
Weak Strikes: Although not directly a result of the over polishing itself, the diminished details can give the appearance of a weak strike, as less metal flows into the shallower recesses of the die.
Die polishing lines: When a die is subjected to over-polishing, it may leave subtle scratches or fine lines on the smooth surface of the die. During the minting process, these tiny lines are transferred to the final coin surface in the form of raised fine lines.