In this 1984 coin, I see too many errors, doubled die date, and "In God We Trust", without "Trust". A very special and vintage coin. what is your opinion, please?
I don't see any hub doubling on the date, but the missing part of IGWT may be the result of a grease-filled die.
Welcome to Coin Talk. Better photos would help. All I can see from the photos you posted is that the coin was struck with a very deteriorated die. Your coin looks something like this: Photo is from Error-ref.com https://www.cointalk.com/threads/1984-doubled-die-obverse.368742/
That is a normal cent struck with an extremely worn die. It would be advisable for you to research the minting and die making processes, and how doubled dies are created, you can then examine your coins with a more knowledgeable eye and easily discard many coins that look a little different as being "errors"
The Die that minted that coin should have been removed from doing so several million coins earlier. Being zinc composition makes it worse.