Can't help specifically with your penny, but I had sent one in for attribution a while back: came back as a doubled master die. Here's part of what John wrote back to me: "I always look for the die gouge inside the upper S in TRUST to identify this one." (to ID it as the doubled master) My pic of the die gouge isn't very good in my post, but at least it will give you the location to look. https://goccf.com/t/488645&SearchTerms=1972,penny, DDO
Your phone is too close to the coin to focus properly. You can't fill the whole frame with the coin. It works much better if you back off, get the coin in proper focus, and then crop the image.
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