Error coins

I don’t collect errors but a fellow collector I know only collects coins from circulation (never pays more than face value for anything). They had these two error coins (among many others) in their collection. I was curious what type of errors these are and if they are rare or worth getting slabbed. I know they are not uncirculated so that’s why I wasn’t sure about slabbing.
The first one is a 1984 Lincoln cent where the “4” appears to be over struck. I couldn’t find anything about this error online so perhaps you could shed some light?
The second one is a 1999 Connecticut state quarter with what appears to be some type of oiling error especially noticeable on the obverse. The reserve does not show as much loss of detail. I don’t know if this error occurred because the coin blank got leftover oil on it from the machine striking the coins and didn’t get struck correctly or I am not understanding the process correctly. Please shed some light on this for me.
Thanks for any information you can provide about these coins.
Comments
Die chip on the cent.
Struck through on the quarter.
I was going to say a plating bubble rupture due to zinc corrosion on the cent
we'll need better pics
Unfortunately I do not have a better camera. I am also not much of a coin photographer either.
Actually they are dark but in focus and other important stuff.
You did better than a lot of new people.
You could try just posting the obverse of the cent and don’t worry about shrinking it. Just crop it to the coin edges.
The quarter is an error coin but not nearly dramatic enough to put in a holder.
When I see the coins again I will try to take better pictures if I can. I was kind of in a rush when I did so next time I will focus them better.
Good to know about the quarter. I just wasn’t sure if error was major enough to warrant a holder even though it’s not mint state.
Great struck thru on the quarter. Lots of entirely missing lettering and also heavy impact to the portrait.
Indeed - Struck through "Grease" on the quarter - but Zinc cent is just plating bubble screwing up the date.
"When they can't find anything wrong with you, they create it!"
Struck through grease on the quarter, plating bubble or die chip on the cent. Neither will command much of a numismatic premium, if any - and not worth slabbing. Cheers, RickO
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In the future you should start your own thread rather than piggybacking on an older thread unless you have the exact same coin and issue. It makes it more confusing when you do it this way.
My Collection of Old Holders
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