NumisNook
The Journal
Understanding the Sheldon Coin Grading Scale
Where the 1-to-70 grading scale came from, how the letter-and-number abbreviations work, and what each broad grade band generally looks like on a coin.
How Mints Actually Strike a Coin: From Blank to Finished Piece
The journey from melted metal to a finished coin — rolling, blanking, upsetting, and striking — and how the process evolved from the hammer to the modern high-speed press.
Reading a Coin: Mint Marks, Dates, and Designers
What the small letters and initials on a coin actually mean — mint marks that identify where it was struck, and designer initials that credit the artist behind the design.
A Short History of the World's Currencies: From Barter to Banknote
From early bartering and the first Lydian coins to hammered medieval silver, steam-powered mints, and the eventual rise of paper money and decimal currency systems.
Building a Coin Collection That Tells a Story
Type sets, date-and-mintmark runs, topical collections, and collecting by era — different organizing approaches that turn a pile of coins into a coherent, documented collection.
Protecting Your Coins from PVC Damage and Humidity
Why soft vinyl flips cause the sticky green residue collectors call 'PVC damage,' how humidity accelerates toning and corrosion, and what archival-safe storage actually looks like.
Common Die Varieties and Errors Collectors Look For
Doubled dies, repunched mint marks, off-center strikes, and die cracks — the physical signatures each one leaves, and how error and variety collecting became its own corner of the hobby.
What the Sheldon Scale Actually Measures (and What It Doesn't)
A walk through what the 1-to-70 grade number encodes about a coin's condition, using the grade guide's own reference data — and a clear line under everything the number does not tell you.
Why Mintage Alone Doesn't Tell You What a Coin Is Worth
Two illustrative coins, run through the same rarity-scale math, show why a low mintage figure and genuine scarcity are two different things — and why even accurate scarcity still isn't a price.
Checking a Coin's Weight: A First Screen Against Fakes and Alterations
Counterfeits and altered coins are a real problem in this hobby. A postal scale and the alloy specification, run through a real weight-breakdown calculation, are a legitimate first screen — not a certification.
Why You Should Never Clean a Coin
Cleaning a coin is the hobby's classic beginner catastrophe — nearly always permanent, nearly always detectable, and nearly always the wrong instinct. What the grading scale itself says about why, and what to do instead.
Choosing a Coin Holder (and Why PVC Is the Enemy)
Flips, capsules, album pages, and slabs each solve a different storage problem — but the material they're made from matters more than the format. A sizing walkthrough using real diameters.