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I'm still very new to this hobby, so I started with rolls from the bank. While searching through variety dates, I came across some 1999 D that were missing part of the lettering. The next batch from the bank were 2022 rolls, which seem to have the same missing lettering. The 2022 rolls are uncirculated, I'm sure. What causes this? Is it a grease filled die, or wear and tear?
One culprit is the obverse design.
The base of the bust is in this area on the opposite side of the coin and is fairly deep. This "depth" can impede metal flow into the devices you mention while being struck.
Cliff has it exactly right. You will see a weakly-struck ATES OF on most modern cents.
Would this qualify as a weak strike? Any potential for a collection?
No to the weak strike, it is a metal flow issue.
As to being collectible, the issue is too common to be very desirable except as an educational piece.