Almost every family has one: a jar, a cigar box, or a coffee can full of old coins that somebody saved decades ago. Most of those coins are worth face value. But mixed in with the ordinary ones, there are often coins worth ten, a hundred, or even a thousand times what’s stamped on them — and they’re surprisingly easy to spot once you know what to look for.

Start with the dates — silver hides in plain sight

The single fastest check you can do: any US dime, quarter, or half dollar dated 1964 or earlier is 90% silver. That means even a worn, common coin from that era is worth many times its face value in metal alone. Kennedy half dollars from 1965 through 1970 contain 40% silver and get overlooked constantly.

Sort your jar by date first. Everything 1964 and older goes in its own pile — that pile has real value before you even consider rarity.

Check the mint mark — the small letter that changes everything

Look for a small letter on the coin, usually near the date or on the reverse. It tells you which mint struck the coin, and for many dates, one mint’s version is common while another’s is rare.

No letter or P — Philadelphia, usually the highest mintage
D — Denver
S — San Francisco, often the scarcer strike for older dates
CC — Carson City, and if you see this on a silver dollar, stop sorting and put it somewhere safe

The classic example: a 1916 Mercury dime from Philadelphia is a common coin. The same dime with a “D” from Denver is one of the most sought-after coins of the twentieth century.

Rarity isn’t about how old a coin is. I’ve bought thousand-dollar coins from the 1930s and fifty-cent coins from the 1800s. The date matters less than the mintage.
— Marty Upfall

Condition: why you should never clean a coin

This is the most expensive mistake we see, so it deserves its own section: never clean your coins. Not with silver polish, not with baking soda, not with a soft cloth and good intentions. Collectors prize original surfaces, and cleaning leaves microscopic scratches that can cut a coin’s value by half or more instantly. A dark, toned, “dirty-looking” coin is exactly what serious buyers want to see. Leave them as they are.

Coins and bills worth a second look

Beyond silver, keep an eye out for these in any inherited collection:

Gold coins of any kind — pre-1933 US gold pieces are valuable without exception
Morgan and Peace silver dollars — always worth well above face value
Buffalo nickels and Indian Head pennies — common dates are modest, key dates are not
Wheat pennies (1909–1958) — most are minor, but 1909-S, 1914-D, and 1922 no-D are famous rarities
Foreign silver and gold — old European and Latin American coins are often heavy in precious metal
Anything in an old holder or envelope — if someone took the trouble to label it decades ago, there was probably a reason

When it’s time to get a real offer

Online price guides show retail asking prices, not what dealers actually pay, and photos can’t capture the details that separate a common coin from a rare variety. The only way to know what your collection is truly worth is to put it in front of someone who buys coins every day and can evaluate strike, surfaces, and varieties in person — and who will walk you through the value of each piece rather than making one vague offer for the whole box.