Finally, it ought to be pointed out that "the Mint" doesn't make zinc penny blanks. These are subcontracted out to a private corporation, a zinc refinery in Greeneville, Tennessee. The company makes the zinc sheets, stamps out the blanks, rims them to turn them into planchets, and electroplates them, so they can be shipped to the various Mint branches and fed directly into the coining presses with no treatment from the Mint required.
Because the plating process is done after the punching-out of the blank, if any clips or bitten rims occur with a zincoln, the plating will extend to include the inside of the clip or bite. So if you see a coin like this, where most of the coin is plated just fine but the "clip" is not, then it's safe to assume it's post-mint damage, not a clip.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis