Sandon

If you are interested in U.S. coins, you should obtain a current (2024, 2025 edition likely to appear in a few months) or recent edition of A Guide Book of United States Coins, commonly known as the "Redbook". It is available online from its publisher at whitman.com. There you would find that the 1974 Lincoln cent (no mint mark, Philadelphia mint) had a mintage of over 4.2 billion pieces and the 1968-D (Denver mint) Roosevelt dime a mintage of nearly 481 million. They still circulate in the United States and have no value to collectors unless in uncirculated (new) condition and even then only if attractive with minimal blemishes. Both of your coins are worn and have no collector value.  (I assume that the "wheat ears" reverse is from a different cent, as that reverse was not used after 1958.)
   The non-U.S. coins also appear to be common modern issues with circulation wear. You can check their retail values on the NGC World Coin Price Guide at World Coin Price Guide and Values | NGC (ngccoin.com).

I'm sorry but you have received some bad information there are no missing letters on your 1974 US cent.  If you have read that a coin without a mint mark is rare that is completely false information.   The US mint produces coins at several locations.  The Philadelphia location has seldom used a mint mark.  So a coin without a mint mark simply means it was produced at the Philadelphia facility, it is not an error, and in poor condition like your coin is only worth 3 cents for the copper metal value in the coin.  Again it is unfortunate that you have received misinformation about these coins in the past, they are not rare or valuable.

This concept gives "low ball set" a whole new meaning!  I have a modern coin that NGC generically labeled "GEM PROOF" that was scored as a PF 65. I think that these "BRILLIANT UNCIRCULATED" coins would be scored as at least MS 60s if the administrators were asked to do so, but apparently @Captainrich doesn't want them to.

This concept gives "low ball set" a whole new meaning!  I have a modern coin that NGC generically labeled "GEM PROOF" that was scored as a PF 65. I think that these "BRILLIANT UNCIRCULATED" coins would be scored as at least MS 60s if the administrators were asked to do so, but apparently @Captainrich doesn't want them to.

This concept gives "low ball set" a whole new meaning!  I have a modern coin that NGC generically labeled "GEM PROOF" that was scored as a PF 65. I think that these "BRILLIANT UNCIRCULATED" coins would be scored as at least MS 60s if the administrators were asked to do so, but apparently @Captainrich doesn't want them to.