What is your coin collection
actually worth?

The three honest ways to value a coin collection

There are three. They are not equally good. Knowing which one a number comes from is more important than the number itself.

The gap between Method 1 and Method 3 is often 30–60 percent. A 1933 Penny in EF advertised at £85,000 sells at hammer for £55,000. A common Victorian half-crown asked at £80 sells for £35. If you're valuing a collection for insurance, sale or estate, only Method 3 holds up.

How MyCoinage values a coin

Every coin in the catalogue gets a price per grade, drawn from realised sales. The pipeline:

1. Scrape: verified-sold listings from eBay UK/US, plus hammer prices from Spink, Baldwin's, Noonans and Onebid auction archives. Asking prices are filtered out.
2. Verify: every scraped row is checked against the catalogue: does the denomination match? The country? The year range? Outliers and mismatches are flagged for a human admin to review before they go live.
3. Aggregate: the median of the last 90 days of verified sales per (coin, grade) pair becomes the published value. Outliers more than 3× the median are excluded from the average.
4. Compare: a 30-day percentage change is computed against the previous window so you can see whether the price is trending up or down.
5. Score liquidity: rolling 12-month sale frequency becomes a 1–100 liquidity score. Low scores warn that the listed price is theoretical.

This is documented per coin: every coin page shows the source of every price, with a link back to the original listing where one is available. Nothing is opaque. If you want to know why a price is where it is, the data is one click away.

Per-coin value vs portfolio total

A collection value is the sum of its parts, but the parts behave differently. Three categories sit inside almost every UK collection, and they need to be valued differently:

1. Bullion-led coins

Sovereigns, Britannias, Krugerrands, gold proof £5s. The metal price (gold or silver spot) is a hard floor. The numismatic premium is the percentage above melt that the market pays for the specific coin. MyCoinage computes melt from current spot prices (refreshed every hour) and shows the premium separately so you can see what you're actually paying for.

2. Numismatic coins

Older silver, copper, base-metal pieces with no significant melt value. The price is entirely about scarcity, condition and demand. Mintage is the leading scarcity signal, and MyCoinage stores it on every coin. A 1937 George VI proof crown has a mintage of 26,000 and trades differently from a 1953 Elizabeth II crown with a mintage of 5.96 million.

3. Modern commemorative

Commemorative 50ps, £2s, £5s, NIFC (not-intended-for-circulation) issues. The trickiest category to value because issue prices, secondary-market prices and bulk-buy resale prices often disagree. The realised-sales approach catches what these actually trade at on secondary, which is usually well below RRP and almost always below dealer asking.

What "rare" really means for value

Rarity drives premium, but only when paired with demand. A coin can be rare and still cheap (because nobody collects that series), or relatively common and expensive (because everyone collects that series). MyCoinage handles this with two scores:

• Rarity score (1–100): derived from mintage, survival rate estimates and demand signals. Higher means rarer in real terms.
• Liquidity score (1–100): how often the coin actually trades. Higher means more sales per year, so the published price is more reliable.

Rare + liquid (Kew Gardens 50p, 1933 Penny) = a high price you can probably realise. Rare + illiquid (some pre-decimal patterns and trial pieces) = a high notional value but you may wait years to find a buyer at it. Both scores show on every coin page.

Insurance valuation vs market valuation

They're not the same thing. Insurers want a value that lets them replace the coin if it's lost or stolen, which means the price you'd pay buying a like-for-like coin today, not the price you'd realise selling. Buy-side prices are typically 15–30 percent above sell-side realised prices.

MyCoinage publishes the realised (sell-side) price by default because that's the most defensible number for almost every other purpose. For insurance, you can use the realised value as a starting point and add a replacement-cost margin (most home-contents insurers will accept this with the underlying realised data attached).

Pro members can export a PDF inventory with photographs, grades, market values and purchase history per coin, ready to attach to a home-contents policy or specialist numismatic cover.

What the value tracker shows you

Coin collection valuation FAQ

Related reading

• Rare UK Coins List (Top 25) — the most valuable modern UK coins, ranked.
• UK Coin Value Checker — step-by-step for valuing any British coin.
• What makes a coin rare? — the 5 factors behind rarity scores.
• Coin Collection Insurance UK — valuing for cover.
• Coin Grading Guide — the grades that drive every value.
• Coin Price Tracker — per-coin price history.