Coin Collecting Glossary

86 terms every collector and dealer runs into — grading, mint marks, errors, market vocabulary, and storage. New to this? Start with the brief history of coin collecting.

A

About Good (AG): Grade AG-3: very heavily worn, with the rim worn into the legends and only the outline of the main design remaining.
About Uncirculated (AU): Grades AU-50 through AU-58: a coin with only slight wear on its highest points, retaining most of its detail and much of its original luster. Just below Mint State.
Air-Tite: A popular brand of round, hard acrylic capsule that snaps around a single coin for inert, archival storage. A common way to protect a raw coin.
Album friction: Light rub on a coin's high points from the plastic slides of a coin album, which can drop an otherwise uncirculated coin to About Uncirculated.
ANACS: The oldest U.S. third-party grading service, established by the American Numismatic Association in 1972 and later independent. Widely used, especially for varieties and error coins.
Ask: The wholesale price a dealer will sell a coin for — the sell side. The gap between it and the bid is the spread.
Attribution: The precise identification of a coin — its date, mint, type, and any variety — usually keyed to a standard reference number.
Auction houses: Firms that sell coins by public auction. Major numismatic auctioneers include Heritage Auctions, Stack's Bowers, and GreatCollections; realized prices from their sales are an important gauge of market value for scarce coins.

B

Bag marks: Contact marks acquired specifically from coins knocking together in mint bags — common on large silver coins like Morgan dollars. See contact marks.
Bid: The wholesale price a dealer will pay for a coin — the buy side. Published bid levels come from sheets like the Greysheet. Paired with the ask.
Bimetallic: A coin struck from two different metals bonded together, typically a ring of one metal around a center plug of another. Common in modern world coinage.
Broadstrike: An error where a coin was struck without the retaining collar, so the metal spread outward and the coin is wider and thinner than normal, with no edge reeding.
Bullion: Precious metal — gold, silver, platinum — valued primarily for its metal content rather than its rarity or design. A bullion coin like the American Silver Eagle trades close to its melt value plus a premium.
Bullion premium: The amount a bullion coin sells for above its raw melt value, covering minting, distribution, and demand.
Bust: A portrait showing the head and upper chest of a figure. Early U.S. coin types are named for their busts — Draped Bust, Capped Bust — as described in the history of coin collecting.

C

Cameo (CAM / DCAM): A contrast on proof coins between frosted raised devices and mirrored fields. Cameo (CAM) denotes the effect; Deep or Ultra Cameo (DCAM) denotes a stronger, deeper frost.
CDN: Coin Dealer Newsletter, the publisher behind the Greysheet and Greensheet wholesale pricing guides.
Circulated: A coin that shows wear from use in commerce, grading below Mint State — anywhere from About Uncirculated down to Poor on the Sheldon scale.
Clad: A layered composition with an outer coating bonded to a different core metal. U.S. dimes, quarters, and halves went to a copper-nickel clad sandwich over a copper core after the Coinage Act of 1965 removed their silver.
Coin album: A book with ports for a full series, brands like Dansco and Whitman being standards. Convenient, but sliding plastic strips can cause album friction.
Common date: An issue struck in large numbers and readily available in most grades, valued near bullion or type-coin levels rather than for its rarity.
Contact marks: Small nicks and dings a coin picks up from striking against others, especially in mint bags. Their number and location are a primary factor in Mint State grading. Also called bag marks.
Copper-nickel: An alloy of copper and nickel used for the outer layers of modern U.S. clad coinage and, historically, for the five-cent piece.
Cotton gloves: Lint-free gloves worn to handle coins so skin oils and fingerprints don't reach the surface. Always hold a coin by its edge, gloved or not.
Cud: A raised, featureless blob on a coin where a piece of the die broke away at the rim, leaving unstamped metal. A mint error.

D

Denomination: The face value a coin represents — cent, nickel, dime, quarter, half dollar, dollar. A single design series may span several denominations.
Details grade: A grade a coin receives when a problem — cleaning, damage, corrosion, or a repair — prevents a clean numeric grade. The service notes the approximate wear level plus the reason (e.g. “XF Details — Cleaned”). Contrast with a straight grade.
Die crack: A raised, irregular line on a coin where the die had cracked; metal flowed into the crack during striking. A large break at the rim can grow into a cud.
Doubled die: A die that received a doubled image during manufacture, so every coin struck from it shows the doubling — most famously the 1955 Doubled Die Lincoln cent. Not to be confused with worthless machine or “strike” doubling.

E

Edge: The third surface of a coin, the outer rim perpendicular to the faces. Edges come reeded (grooved, like a dime), plain (smooth), or lettered (inscribed with text).
Encapsulation: The process of sealing a graded coin permanently in a rigid, tamper-evident holder to protect it and to lock the grade to that specific coin.
Extremely Fine (XF / EF): Grades XF-40 and XF-45: light, even wear on the high points but with all major detail sharp and some luster often clinging in protected areas.

F

Fair (FR): Grade FR-2: extremely worn but still identifiable as to type; most detail gone.
Field: The flat, blank background of a coin, around and between the raised design elements. The condition of the field drives much of a coin's grade — marks show there first.
Fine (F): Grade F-12/F-15: considerable even wear, but the design and legends remain complete and legible.
First Strike / Early Releases: Marketing designations (PCGS “First Strike,” NGC “Early Releases”) for coins submitted within the first weeks of an issue's release. They indicate timing of submission, not superior quality.
Full Bands (FB): A strike designation for Mercury dimes whose central horizontal bands on the fasces are fully separated and rounded — evidence of a strong strike, and a value premium.
Full Bell Lines (FBL): A designation for Franklin half dollars showing the complete lines across the bottom of the Liberty Bell, unbroken by contact marks. Evidence of a strong strike.
Full Head (FH): A designation for Standing Liberty quarters with complete detail in Liberty's head — a demanding strike that commands a premium.
Full Steps (FS): A designation for Jefferson nickels showing the full, unbroken steps of Monticello (five or six lines). A mark of a strong strike.

G

Good (G): Grade G-4/G-6: heavily worn, with the design visible only in outline and the rim merging into the lettering in places. Despite the name, a low circulated grade.
Greensheet: The CDN pricing sheet for U.S. paper money, the currency counterpart to the Greysheet.
Greysheet: The Coin Dealer Newsletter's wholesale bid/ask price sheet for U.S. coins — the long-standing dealer-to-dealer pricing benchmark. Published by CDN.

H

Holder: Any container a coin is kept in; in grading, a synonym for the sealed slab. Also used for self-storage holders like the 2×2 flip.

I

ICG: Independent Coin Grading Company, founded in 1998 — a third-party grader competing with PCGS and NGC.

K

Key date: The scarcest, most valuable issue in a series — the coin that makes a complete set hard to finish, such as the 1909-S VDB Lincoln cent or the 1916-D Mercury dime.
KM number (KM#): A cataloging number from the Standard Catalog of World Coins (Krause-Mishler) used to identify world coins uniquely — the world-coin equivalent of a standard reference number.

L

Legend: The main lettering on a coin, such as the country name or “UNITED STATES OF AMERICA.” Distinct from the shorter motto.
Luster: The way light rolls across a coin's surface — the “cartwheel” sheen created by metal flow during striking. Original, unbroken luster is a hallmark of an uncirculated coin and a major grading factor.

M

Melt value: The value of a coin's metal content alone, at current spot prices — the floor under any coin with precious-metal content, regardless of collectibility. Also called intrinsic or bullion value.
Mint mark: A small letter identifying the mint that struck the coin: P (Philadelphia), D (Denver), S (San Francisco), CC (Carson City), W (West Point), and historically O (New Orleans). Mint marks can make otherwise common coins into key dates.
Mint State (MS): The uncirculated grades, MS-60 through MS-70 at the top of the Sheldon scale. Higher numbers mean fewer contact marks and stronger luster. Mintward returns MS grades among its results — see the AI grading FAQ.
Motto: A short phrase or slogan on a coin — on U.S. coinage, “IN GOD WE TRUST” and “E PLURIBUS UNUM.”

N

NGC: Numismatic Guaranty Company, founded in 1987 — the other major third-party grading service alongside PCGS. Its census is the counterpart to PCGS's population report.
Numismatic value: A coin's worth to collectors above its melt value, driven by rarity, condition, demand, and eye appeal. What separates a collectible coin from a piece of bullion.
Numismatist: A person who studies or collects coins, paper money, and related objects. Numismatics is the broader field.

O

Obverse: The “heads” side of a coin — the front, usually carrying the principal design, portrait, or date. The opposite of the reverse.
Off-center: An error where the planchet was struck out of position, so part of the design is missing and blank planchet shows. Usually described by how far off — “20% off-center.”
Overdate: A die on which one date was punched over another, leaving traces of both — for example the 1942/1 Mercury dime. A collectible variety.

P

PCGS: Professional Coin Grading Service, founded in 1986 — one of the two dominant third-party graders. It grades coins to a common standard and seals them in a tamper-evident slab. See the history of grading.
Poor (PO): Grade PO-1, the bottom of the Sheldon scale: barely identifiable, with just enough detail to determine the date or type.
Population report: A grading service's tally of how many examples of a given coin it has certified at each grade (NGC calls its version a “census”). Collectors use it to gauge rarity in high grade.
Price guide: A published reference of estimated coin values — retail guides like the Red Book and online guides such as the PCGS Price Guide, versus wholesale sheets like the Greysheet.
Proof: A coin struck with specially prepared, polished dies and planchets to produce a sharp, mirror-fielded collector coin — not a grade but a method of manufacture. Proofs are graded on the same numeric scale, written as PR or PF.
Proof-Like (PL): A business-strike coin whose fields are reflective enough to resemble a proof. A stronger designation, Deep Mirror Proof-Like (DMPL), is given to coins — classically Morgan dollars — whose mirrored fields reflect clearly at six inches or more.
PVC damage: A green, sticky film that forms on coins stored in soft flips made with polyvinyl chloride, as the plastic's softeners break down. It is corrosive and, if left, will permanently harm the surface — use PVC-free holders.

R

Raw: A coin that has not been professionally graded and encapsulated — i.e. not in a slab. The opposite of certified.
Red Book: A Guide Book of United States Coins, the annual retail price-and-reference guide first edited by R.S. Yeoman. A standard starting reference for U.S. collectors.
Repunched mint mark (RPM): A mint mark punched into the die more than once in slightly different positions, back when mint marks were added by hand. A sought-after variety.
Reverse: The “tails” side of a coin — the back. On U.S. coins it typically carries the denomination, an emblem such as an eagle, and the national motto.
Rim: The raised border running around the outer edge of each face, formed during striking. It protects the design from wear and, on a well-struck coin, is sharp and complete.

S

Semi-key date: A scarcer-than-average date in a series, more available and affordable than a key date but still a step above the common issues.
Series: The complete run of a coin design across every year and mint it was issued — for example, all Lincoln cents from 1909 to date, or every Morgan dollar.
Sheldon scale: The 1-to-70 numeric grading scale used throughout U.S. numismatics, where 1 is barely identifiable and 70 is flawless. Proposed by Dr. William Sheldon in 1949 and later adopted broadly (see the history page). It is the scale Mintward's AI reports against — see the AI grading FAQ.
Silver dollar: A dollar coin struck in 90% silver, as U.S. dollars were through 1935 (Morgan and Peace types). Modern “silver dollars” like the Silver Eagle are .999 fine bullion, not circulating coinage.
Slab: The sealed, tamper-evident plastic holder a grading service encases a coin in, with the grade and certification number printed on an insert. The informal name for professional encapsulation.
Spread: The difference between bid and ask — effectively the dealer's margin. A wide spread signals a thin or volatile market for that coin.
Straight grade: A clean numeric grade with no qualifying problem — the outcome collectors want. The opposite of a details grade.
Strike: How completely the design transferred from die to coin. A strong (full) strike shows crisp, complete detail; a weak strike leaves high points soft even on an unworn coin.

T

Toning: Color a coin develops over time as its surface reacts with the environment. Natural toning is prized and can add value; artificial toning, chemically or thermally induced to fake it, is considered damage and earns a details grade.
Two-by-two flip (2×2): A two-inch-square cardboard holder with a clear window, stapled shut around a coin. Cheap and common; keep staples flat so they don't scratch neighboring coins.
Type: A distinct design of a coin. “Type collecting” means acquiring one example of each design rather than every date-and-mint combination.

U

Uncirculated: A coin that never entered circulation and shows no wear, equivalent to Mint State. It may still carry contact marks from handling at the mint.

V

Variety: A recognized, repeatable difference within a date — a doubled die, a repunched mint mark, or an overdate — caused at the die-making stage and shared by every coin struck from that die.
Very Fine (VF): Grades VF-20 through VF-35: moderate wear over the whole design, with the main features still clear and bold.
Very Good (VG): Grade VG-8/VG-10: well worn, with major design outlines visible but interior detail mostly smoothed away.

Missing a term you'd expect to see? Email support@mintward.app. See also the FAQ and the history of coin collecting.