Beginner Coin Collecting Mistakes and How to Avoid Them

My grandfather kept a biscuit tin under his bed. Inside, wrapped in old newspaper, were a handful of crowns, a few Victorian pennies, and one coin he could never quite identify but refused to part with. He never called himself a collector. He just liked them. When he passed, that tin came to me, and somewhere between unwrapping a blackened 1887 double florin and realising I had no idea what I was holding, I became a coin collector whether I meant to or not.

That was twelve years ago. In the time since, I have made almost every mistake a beginner can make — and I have spoken to enough people at coin fairs in York, Birmingham, and London to know that these mistakes are remarkably consistent. The same errors come up again and again, not because collectors are careless, but because nobody tells you the rules until after you have already broken them. This guide is my attempt to fix that.

Cleaning Your Coins — The Most Expensive Mistake You Will Ever Make

Let us start with the one that causes the most damage, because it is also the one that feels the most logical. You find an old coin. It is dirty, dark, and covered in what looks like grime. Your instinct is to clean it. You want to see what is underneath. So you reach for the washing-up liquid, or worse, a bit of silver polish, and you get to work.

Please do not do this.

Cleaning a coin — even gently, even with the best intentions — removes the patina. Patina is the natural toning that develops on a coin’s surface over decades or centuries of oxidisation. To an untrained eye, it looks like dirt. To a collector or dealer, it is evidence that the coin has not been interfered with. A naturally toned Victorian penny with original patina is worth considerably more than the same coin scrubbed bright with a toothbrush. The scrubbing leaves microscopic scratches visible under magnification, and any experienced dealer will spot them instantly.

At coin fairs, cleaned coins are sometimes described bluntly with the word “cleaned” in brackets after the grade — and that single word can reduce a coin’s value by fifty per cent or more. I once watched a man at the Midland Coin Fair in Coventry offer a dealer what he thought was a fine 1933 penny — an extraordinarily rare coin — only to be told quietly that it had been polished at some point and the surface was compromised. He had inherited it and cleaned it before having it assessed. The look on his face was difficult to watch.

The rule is simple: do not clean coins. If a coin is genuinely encrusted with something that requires removal — for example, active bronze disease, which is a greenish corrosion that will continue to damage the coin — take it to a professional conservator or seek advice from the British Numismatic Trade Association (BNTA) before touching it.

Buying Without Doing Your Research First

Coin collecting is a market, and like any market, it rewards people who understand what they are buying. The mistake most beginners make is not stupidity — it is enthusiasm. You find a stall, you see something you like the look of, and you buy it on impulse without knowing whether the price is reasonable, whether the coin is genuine, or whether it fits into any kind of coherent collection.

There is nothing wrong with impulse buys, but they should be small ones. Before you spend serious money, spend time. The Standard Catalogue of British Coins — published annually by Spink & Son and commonly called the Spink catalogue — is the bible of British coin collecting. It lists valuations for coins in different grades of condition, and it is available from Spink’s shop on Southampton Row in London, from dealers across the country, or online. A copy costs around £25 and will save you many times that amount.

The Royal Mint’s own historical records are also freely available online and are useful for understanding mintage figures — how many of a particular coin were produced. Mintage matters because rarity drives value. A 50p coin with a mintage of 210,000 is worth researching further; one with a mintage of 22 million probably is not going to fund your retirement.

Online resources like Coin Hunter and Change Checker are geared towards modern circulated coins and are excellent starting points for beginners who want to understand the current collector market for everyday coinage. For older, more serious material, the British Numismatic Society publishes scholarly resources that are worth bookmarking even if you are not yet ready for them.

Ignoring Coin Grading Entirely

Grading is the system collectors and dealers use to describe the condition of a coin, and it is the single most important factor — after rarity — in determining value. Two coins that look similar to a newcomer can be in completely different grades and differ in value by hundreds of pounds.

British coin grading uses a specific set of terms that differ slightly from the American system you might encounter online. Here are the main grades you need to know, from worst to best:

Poor (P): Barely identifiable. The date may be unreadable.
Fair (F): Heavily worn but the main design is visible.
Almost Good / About Good (AG): Very heavily worn.
Good (G): Major design visible but flat and well worn.
Very Good (VG): Design clear but with significant wear on high points.
Fine (F): Moderate to considerable wear, but all major details sharp.
Very Fine (VF): Light to moderate wear, design clear, some detail remaining.
Extremely Fine (EF or XF): Only slight wear on the highest points. Most detail intact.
About Uncirculated (AU): Traces of wear on highest points only. Looks nearly new.
Uncirculated (Unc): No wear. Mint lustre present.
Fleur de Coin (FDC): Perfect. No contact marks, full lustre, flawless.

The jump in value between grades can be dramatic. A George V florin in Fine condition might sell for £5. The same coin in Extremely Fine might fetch £40 or more. Learning to grade takes practice, and beginners consistently overgrade their coins — meaning they think a coin is in better condition than it actually is. This leads to disappointment when a dealer offers less than expected. The solution is to handle as many coins as possible, attend shows, and ask experienced collectors to help you calibrate your eye.

Storing Coins in the Wrong Materials

This one is quiet and slow, which makes it more dangerous. Poor storage does not ruin a coin overnight — it ruins it over months and years, and by the time you notice the damage, it is done.

PVC (polyvinyl chloride) is the main culprit. Many cheap coin folders, wallets, and soft plastic flips contain PVC, which off-gasses a chemical that reacts with the metal in coins, leaving a greasy green or yellow residue that is almost impossible to reverse without causing further damage. PVC damage is, rather frustratingly, irreversible in most cases.

What you should use instead:

Mylar or polyethylene coin flips (not PVC soft flips — check the packaging)
Inert hard plastic capsules, such as those made by Leuchtturm or Quadrum
Acid-free cardboard 2×2 holders with Mylar windows
Proper coin albums with inert, archival-quality pages

Suppliers like Lighthouse (Leuchtturm’s UK brand), Murray Hudson, and various dealers on the BNTA’s member list stock appropriate storage materials. Avoid anything sold cheaply in general stationery shops unless you can confirm the materials are archival quality.

Beyond materials, think about environment. Coins should be stored away from humidity, direct sunlight, and extreme temperature changes. A bedroom wardrobe in an interior wall is generally fine. An attic or garage is generally not.

Chasing Trends Instead of Collecting What You Love

Around 2009 and 2010, the Royal Mint issued the Kew Gardens 50p — a coin with a mintage of just 210,000 featuring the Chinese Pagoda at Kew Gardens in London. For years, most people spent them without a second thought. Then someone noticed the mintage figure, the coin went viral on social media, and suddenly everyone was checking their change and listing Kew Gardens 50ps on eBay for absurd sums.

The lesson here is not that you missed a trick. The lesson is that chasing coins purely because they are fashionable is a losing strategy. By the time the general public knows a coin is valuable, the easy money has already been made. Prices spike on speculation, then often settle back down when the hype fades. Collectors who bought Kew Gardens 50ps at peak hype prices for investment purposes were frequently disappointed.

The collectors who are happiest — and often do best financially over the long term — are those who collect what genuinely interests them. If you love the milled silver coinage of Charles II, collect that. If you find Victorian pennies fascinating in their complexity (and they are fascinatingly complex, with dozens of varieties across Queen Victoria’s reign), focus there. Passion makes you a better researcher, a more patient buyer, and someone who enjoys the hobby regardless of market fluctuations.

Underestimating Fakes and Forgeries

Forgeries are older than coin collecting itself. The Romans faked their own currency. Medieval counterfeiters were executed for it. And today, high-quality fakes of sought-after British coins circulate through online marketplaces with depressing regularity.

The most commonly faked British coins include rare dates and varieties of Victorian silver, Georgian gold, and — particularly in recent years — supposedly rare modern coins sold to
unsuspecting buyers on platforms like eBay. The 50p and £2 coin market has been particularly plagued by listings claiming astronomical values for coins that are, in reality, extremely common. Beyond outright fakes, there are also cleaned, artificially toned, or heavily polished genuine coins presented as being in far better condition than they are.

Protecting yourself requires building a few simple habits. Buy from reputable dealers who are members of the British Numismatic Trade Association (BNTA) or the International Association of Professional Numismatists (IAPN). For any significant purchase, insist on a certificate of authenticity or a return policy. When buying online, study the photographs carefully — genuine wear has a different character to artificially induced distress, and the lustre on an uncirculated coin cannot be convincingly replicated by polishing. Invest in a decent loupe, learn the correct weights and dimensions of coins you collect, and cross-reference any unusual purchase against established references such as Spink’s Coins of England and the United Kingdom.

If something feels wrong, it almost certainly is. A coin offered at a fraction of its catalogue value is not a bargain — it is a warning. The experienced collector is not the one who has never been offered a fake; it is the one who has learned to walk away from them.

Conclusion

Coin collecting is a genuinely rewarding pursuit, and the mistakes outlined here are not reasons for anxiety but signposts worth knowing before you begin. Buy carefully, store properly, research before you spend, and seek out communities of fellow collectors who can share their knowledge and experience. The British numismatic tradition is a rich one, and there is no better time to become part of it.