A mint mark identifies which facility struck a coin — and can meaningfully change its scarcity and value. Here's how to read one and why collectors track them.
Short answer: a mint mark is a small letter or symbol on a coin identifying which specific mint facility struck it — and because different facilities often strike different quantities of the same coin design in the same year, the mint mark can be the difference between a common coin and a genuinely scarce one.
Many countries operate more than one mint facility — the U.S. has struck coins in Philadelphia, Denver, San Francisco, and West Point; Britain's Sovereigns were historically struck across multiple Commonwealth branch mints. A mint mark lets collectors (and historically, the mints themselves) track exactly where a given coin was produced.
Two coins of the exact same design and year can have very different mintages depending on which facility struck them — a proof coin from a low-volume specialty mint can be dramatically scarcer than a bullion-strike coin of the same date from a high-volume production mint. Ignoring the mint mark means potentially missing (or overpaying for) exactly this kind of distinction.
On most modern coins, the mint mark is a small letter near the date or at the base of the design — check your specific series' reference, since exact placement varies. On coins with no visible letter, an unmarked design historically usually indicates the "default" mint for that series, though this convention isn't universal.
Some collectors specifically build a "one coin per mint" set rather than a straightforward date run — this is common with older, multi-mint series like the British Sovereign, where mint origin is arguably as meaningful a collecting dimension as the year itself.
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