1: Rare Lincoln Pennies These one-cent coins might seem insignificant, but certain years and mint marks make them exceptionally rare. Keep an eye out for Lincoln pennies from the 1940s, as they could be worth over $100.

2: Silver Dimes and Quarters Before 1965, dimes and quarters were made of 90% silver. Hold onto these pre-1965 coins, as their melt value alone can be worth significantly more than their face value.

3: Wheat Pennies Distinguishable by the wheat ears on the reverse, wheat pennies minted before 1959 are highly sought after by collectors. Some rare years can sell for hundreds of dollars if found in pristine condition.

4: Buffalo Nickels First introduced in 1913, buffalo nickels are a collector's delight. Look for certain dates, mint marks, and exceptional coin quality to discover buffalo nickels that can command prices above $100.

5: Silver Half-Dollars Similar to dimes and quarters, half-dollars minted before 1965 are made of 90% silver. Even in circulated condition, their intrinsic metal value makes them worth more than 50 cents.

6: Kennedy Half-Dollars Some Kennedy half-dollars minted between 1965 and 1970 were made of 40% silver. These clad coins can still be found in circulation and could potentially be worth more than their face value.

7: Error Coins Occasionally, mistakes occur during the minting process, creating error coins. These oddities, such as double-stamped or inverted designs, can be extremely valuable to collectors and worth hunting for in your loose change.

8: Old Foreign Coins Don't forget to check for foreign coins mixed in with your change. Some older foreign coins, especially those made of silver or with unique designs, can hold surprising value in the collector's market.

9: Misprinted Bills Although not change, misprinted paper currency can still turn up in circulation occasionally. Look for bills with printing errors, such as inverted serial numbers or mismatched colors, as these rarities can catch the eye of collectors.