The short answer
Most old coins found in jars and drawers are worth about their face value, or a little more. Some are worth more: coins made of silver or gold, scarce dates and mint marks, genuine mint errors and varieties, and coins in exceptional condition. The details that matter are small, so look closely before you spend, sell or clean anything.
First rule: do not clean them
Cleaning, polishing or dipping a coin can permanently reduce its value to collectors, often by a lot, because it removes the original surface. Even wiping a coin can leave fine scratches. Handle coins by the edges over a soft surface, and store them in paper envelopes or holders made for coins.
Identify the coin
- Country and denomination: shown on the coin, sometimes in another language or script.
- Date: the year of issue. Some countries date coins using a different calendar.
- Mint mark: a small letter or symbol showing where the coin was struck. Its position depends on the country and series, so check a reference for your coin type. On US coins, the same date can be common with one mint mark and scarce with another, and some coins carry no mint mark at all.
- Design: designs change over time, and some years were struck in more than one version.
- Metal: color and weight help tell silver, copper, nickel and clad coins apart.
Write the details down and look the coin up in a current coin catalog or a reputable reference for that country.
Silver and gold content
Many older circulating coins contain precious metal. US dimes, quarters and half dollars dated 1964 or earlier, for example, are 90% silver, and many other countries also used silver in everyday coins until the mid-20th century. Coins like these have a value floor tied to the metal price, even when the date is common. Check the edge: older US silver coins show solid silver, while later clad coins show a copper stripe.
Condition and grading
Coin condition runs from heavily worn to uncirculated. Professional graders use a 70-point scale, where higher numbers mean less wear and better surfaces, and certified coins are sealed in labeled holders. Look at the high points of the design, such as hair, faces and lettering: a coin with sharp detail and original luster is in better condition than one worn smooth. Graded coins sell differently from ungraded ones, so compare like with like. Professional grading costs money and is usually worth it only for coins that could be valuable.
Errors and varieties
Coins struck incorrectly at the mint can interest collectors: doubled dies (doubling in the lettering or date), off-center strikes, missing design elements, or a coin struck on the wrong metal. Damage after the coin left the mint, such as dents, scratches or heat discoloration, is not an error and usually lowers value. If you think you have an error, have a coin dealer or grading service confirm it before you price it.
Fakes and altered coins
- Silver and gold are not magnetic, so a supposed silver or gold coin that sticks firmly to a magnet deserves suspicion. Some genuine coins are magnetic, though, such as the 1943 US steel cent and coins made of nickel or steel.
- Check the weight and diameter against the published specification with a small scale and ruler.
- Look for soft, blurry detail, a seam on the edge or a greasy look, which can indicate a cast copy.
- Be wary of altered dates or added mint marks on coins that would be rare if genuine.
Photograph coins for a scan and a listing
- Place the coin on a plain dark or neutral background.
- Light it from one side with soft light so the design shows in relief, and avoid the flash.
- Photograph the front (obverse) and back (reverse) straight on, filling the frame.
- Add close-ups of the date and mint mark, and one of the edge.
Sharp, glare-free photos are what let a buyer judge the condition.
Where coins sell best
- Coin dealers and coin shows: quick in-person offers and expert opinions. Ask more than one dealer about valuable coins.
- Auction houses: for rare or high-grade coins and larger collections.
- General marketplaces: a broad audience for mid-range coins, sets and lots, with clear photos of both sides.
- Bullion dealers: for common silver and gold coins sold mainly for their metal.
Common mistakes
- Cleaning a coin to make it look better.
- Pricing a worn coin from sales of uncirculated or graded examples.
- Mistaking damage for a valuable error.
- Spending old silver coins at face value.
Where WorthAI fits
WorthAI has a coin mode built for scanning coins. Scan the coin in soft, even light, and WorthAI identifies the likely coin, estimates a value range and shows the listings behind it, so you can check that the date, mint mark and condition match yours. It cannot grade a coin precisely or confirm that a rare coin is genuine; for anything that could be valuable, ask a coin dealer or grading service.
Frequently asked questions
How do I know if my old coins are worth anything?
Identify the country, denomination, date and mint mark, check whether the coin contains silver or gold, look at its condition, then compare recent sales of the same coin in similar condition.
Should I clean old coins before selling them?
No. Cleaning removes the original surface and can greatly reduce a coin's value to collectors. Sell coins as they are.
Are coins with errors worth more?
Genuine mint errors and varieties can interest collectors, but damage that happened after minting is not an error. Have a dealer or grading service confirm an error before pricing it.
Which US coins contain silver?
US dimes, quarters and half dollars dated 1964 or earlier are 90% silver. Some later coins, such as certain half dollars and commemoratives, also contain silver.