Coins With No Mint Mark

A coin with no mint mark is almost never a rarity, and the disappointment in that sentence is the reason this guide exists. Most of the time it means Philadelphia. Sometimes it means a law was passed. Occasionally it means a mint deliberately hid its own identity. What it almost never means is that you have found something the Mint let slip.

Rule one: no mark usually means Philadelphia

Philadelphia was the only mint in the country's earliest years, so there was nothing to distinguish. Even after branch mints opened in 1838 and began marking their coins, the practice of leaving Philadelphia's unmarked carried on. Most circulating coins today carry a P, a D, or no mark at all, and no mark signifies Philadelphia.

The cent is the standing exception in the other direction. When the P returned to American coinage in 1980, it went onto every denomination except the cent, and that remains true. A modern cent with no mint mark is a Philadelphia cent, and there are billions of them.

Rule two: 1965 to 1967, nobody had one

This is the fact that resolves most of the questions people bring to us. The Coinage Act of 1965 eliminated mint marks outright, for one stated reason: to discourage collecting: the nation was short of coins, collectors were pulling them from circulation to complete date-and-mint sets, and the Mint wanted the coins back in tills. So no mint marks appeared on circulating coins from 1965 to 1967.

Rule three: San Francisco once hid on purpose

The genuinely strange case. The San Francisco Mint struck circulating cents in the 1970s and 1980s without any mint mark, deliberately, so that they could not be distinguished from Philadelphia's coins. There is no way to tell them apart, which is precisely the point. A missing mark is not proof of Philadelphia. It is only strong evidence.

When a missing mark does matter

There are real and famous cases where a coin was struck without the mark it should have carried, and those are genuine mint errors worth real money. They are also heavily faked, and they are established by die diagnostics rather than by the absence of a letter. If you think you have one, the coin needs to go to a major grading service, and you should read spotting counterfeit and altered coins first, because removing a mint mark from an ordinary coin is one of the oldest tricks in the trade.

The reverse trick is more common still: adding a mint mark that was never there, to turn a common coin into a scarce one. Both are the reason grading services exist.

So what is your coin worth?

Whatever a coin of that date, mint and grade is worth today, and the missing letter contributes nothing. Value comes from mintage, survival, grade and demand. Age contributes almost nothing, and neither does a normal absence of a mint mark. See what makes a coin valuable, and mint marks on coins for where to look on each denomination.

Source: United States Mint, Mint Marks.