You might think coins have 2 sides but they actually have 3 when it comes to coin appraisal. The peripheral edges around a coin constitute the 3rd side. Mintmarks can tell you a lot about a coin's origin too.
If there's no mintmark for coins before 1982 or a P on it after 1982, it was struck in Philadelphia. The minting process isn't perfect, so there are often variations and tiny errors or differences in specific sets of coins. These error coins often go out of circulation, resulting in a very rare coin.
Anatomy of a coin
“There are actually 3 and not 2 sides to U.S. coins.”
I recently started spending my Friday nights in front of the television coin tracking. I'm a thirty something rare coin collector who spends 40% of her life waiting for her next big penny break. It's all worth it though.
In finding some old pennies that were worth money, I started to search the web to see what rare coins are for sale. This is some hobby! Some of these coins go for amounts that I wouldn't have thought of!
Most Americans know that quarters were silver before 1965. After 1964, the quarter is made of nickel and copper. A silver quarter today is worth about $3.50, but some silver coins are worth a lot more.
My father died not too long ago, my mother had already preceded him, so I went back to their home and did some cleaning and sorting of what we should keep and what we should donate or throw away. I was an only child, so it was just me.