"Missing serif" coins are found on pennies from the 1850's through to 2010 at least. It happens when the die itself gets filled in with a small piece of material during the minting. Some years have different serifs filled during that year and you can end up with a few different minor varieties that way. The doubled obverse on the 1967 is fairly common; what's nice is that you have both errors on the same coin.
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