Coins have a year on them to show when they were made.
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The Krugerrand coin was minted in 1967 making the earliest coins about 44 years old.
Countries all over the world, past and present, have been producing coins for thousands of years. There would be millions of different types of coins.
Well, it depends on what time. If like from 1650-1750, around WHO CARES?? NOBODY KNOWS!!!!! IT WAS OVER 400 YEARS AGO, ALMOST ALL OF THE COINS WERE MELTED!!!
First you need to decide which country's (or countries') coins you're interested in. Once you know that you can look in books such as Krause's World Coin guides, various Wikipedia articles, etc. that list the metals used for coins by year and denomination.
There was an error in the 2000-P Sacagawea Dollars. It was boldly doubled tail feathers. Only about 5,500 of the 767,140,000 are believed to be errors.