Rule zero: never clean a coin
Before anything else: never clean a coin. Not with silver polish, not with a pencil eraser, not with ketchup, not "just gently." Cleaning creates microscopic scratches and unnatural surfaces that collectors and grading services spot instantly, and it can turn a $500 coin into a $50 coin permanently. Dark, original toning is not dirt — it is often worth more than brightness. The most valuable thing about a 150-year-old coin is that nobody "improved" it.
Coin anatomy
The front is the obverse ("heads"), the back the reverse. The raised flat border is the rim; the side is the edge (reeded, plain, or lettered — it's a real specification, listed on every OunceDesk coin page). The background surface is the field, the raised design the devices, and the date-plus-mint-mark combination is what defines an issue — the basic collectible unit.
Mint marks
A small letter tells you which mint struck the coin: P or nothing (Philadelphia), D (Denver), S (San Francisco), O (New Orleans), CC (Carson City), W (West Point). Location varies by series — on Morgan dollars it's on the reverse below the wreath. Mint marks matter enormously: the same year from different mints can differ in value by 1,000×. Carson City coins carry a permanent Old-West premium; the Morgan series guide shows this vividly.
Mintage and rarity — not the same thing
Mintage is how many were struck; rarity is how many survive, in what condition. Huge mintages were melted wholesale (silver dollars by the hundreds of millions in 1918); some low mintages were saved by the bag. That's why a 12.6-million-mintage coin can be common in worn grades and a conditional rarity in gem — availability at your target grade is what matters. Key-date lists on our series pages explain why each key is rare, not just that it is.
Grading in one paragraph
Grades run from About Good (heavily worn) through Good, Very Good, Fine, Very Fine, Extremely Fine, About Uncirculated, to Mint State (MS60–MS70, no circulation wear at all). Value curves are wildly non-linear: the jump from MS63 to MS65 can be 5–10× for the same coin. Learn where wear shows first on each series (our coin pages list it), buy a loupe before you buy coins, and for valuable purchases prefer coins certified by PCGS or NGC — the two major grading services whose plastic holders ("slabs") make grades tradeable.
Proof vs business strike
Business strikes are made for circulation. Proofs are specially struck for collectors — polished dies, multiple strikes, mirror fields. Proofs aren't "better," they're a different product with a separate market. A related trap: shiny ≠ proof and shiny ≠ valuable. Uncirculated luster is specific and learnable; polished-up damage pretends to be it.
Storage that doesn't destroy coins
- Never PVC. Soft vinyl "flips" leach plasticizer that etches green slime into coins. Use inert holders: cardboard 2×2s, Mylar flips, or direct-fit capsules.
- Handle by the edge over a soft surface; skin oils etch fields.
- Stable, dry, cool. Humidity is the enemy; add silica gel to any storage box.
- Albums are fine for circulated sets and make collecting genuinely fun — that's what our series checklists mirror digitally.
Counterfeits
Fakes are real, improving, and concentrated exactly where beginners shop: key dates and bullion. Defenses, in order: buy from established dealers; know the specs (weight, diameter — a calibrated scale and calipers catch most casts; every OunceDesk coin page lists the numbers); learn each series' known diagnostics; prefer certified examples for anything expensive; and treat "too cheap" as information. Silver and gold are also non-magnetic — a strong magnet is a crude but useful first filter.
A sane way to start
Pick one series you actually like and can afford in mid grades — Jefferson nickels, Roosevelt dimes, or circulated Morgans are classic first sets. Work from a checklist (ours persist in your browser, no account needed), buy the book before the coin, fill common dates from circulation or cheap dealer bins, and save toward the keys instead of impulse-buying them raw. The chase is the hobby; completion is just the excuse.
Where to go next
Browse the coin guides, open the Morgan dollar series guide to see what a deep series looks like, and if you're holding a mixed pile of old change, the junk silver calculator will tell you what the metal alone is worth.