Numistify guide

How to Track a Coin Collection: Beginner’s Guide

Every collection outgrows memory eventually. Here is what to write down, why it matters, and how to keep the habit going.

The short answer

For every coin, record the country, year, denomination and mint mark, the total you paid including buyer’s premium and shipping, where you bought it, where you keep it, and photographs of both sides. Record it when you buy: the mint mark and the total cost are the two fields beginners most often skip and later need.

Why you will want a record

Most collections start in a drawer. Ten or twenty coins, and you remember each one — where it came from, what you paid, why you wanted it. You do not need a record because the collection is small enough to hold in your head.

That changes sooner than people expect. Somewhere past fifty or a hundred coins, the details start to slip. You can still name your favourites, but the rest turns hazy. Was that half dollar forty dollars or sixty? Did it come from the show or from eBay? And the expensive one: do I already have this?

Buying a coin you already own is the most common consequence of a poor record. It is also the most avoidable.

The six things worth writing down

A good record is short. Six things do most of the work.

1. What the coin is

Country, year, denomination, and the mint mark — the small letter showing which mint struck the coin. In the US, D is Denver, S is San Francisco, and no letter usually means Philadelphia.

The mint mark matters more than beginners expect. A 1916 Mercury dime from Philadelphia is a common coin. The same dime with a D is one of the most sought-after coins of the century, because Denver struck only 264,000 of them. Same date, same design, completely different coin.

2. What you paid, and when

Not the price on the tag — the total that left your pocket.

If you buy at auction there is usually a buyer’s premium, a percentage the auction house adds on top of the winning bid. Then shipping. Then, if you send the coin away to be professionally graded, the grading fee.

Say you win a coin at 200 dollars. The house adds a 20 percent premium, so 40. Shipping is 15. You actually paid 255. Write down 200 and every future sum you do will be wrong by a quarter.

3. Where it came from

The dealer, the auction house, the show, or the relative who left it to you. For most coins this is just how you answer “where did I get this?” later. For a good coin it is called provenance, and a documented history can add real value.

4. Where you put it

Which album, box, safe or drawer the coin lives in. It sounds trivial until the collection outgrows one container. Once you have several albums and a couple of boxes, finding a particular coin without a note of where it is means opening everything.

It matters more the better the coin is. The pieces you handle least are the ones you are most likely to misplace, because you are not reminded where they are.

5. A way to tell duplicates apart

The moment you own two of the same coin, “1964 Kennedy half” stops being enough to identify anything. If one cost you 12 dollars and the other 40, and one is in the album while the other is in a safe, you need a way to say which is which.

The usual answer is to give each piece its own short code — a SKU, the same idea shops use for stock. It can be anything you will keep consistent: KH64-01 and KH64-02, or just a running number. What matters is that the code is unique to the physical coin, and that you write it on the flip or the album page so the coin and the record can always be matched up again.

This becomes essential rather than useful the moment you sell. Selling one of two identical coins means knowing which one left, so the cost attached to the one you still own is right.

6. A photograph

Both sides, in even light, before the coin goes into storage. This is the field beginners skip most often and the one that turns out most useful. It shows the coin as it was when you got it, and it settles questions no written note can.

Keep them somewhere you will find them again — a folder per year, or named for the coin. A photograph you cannot locate is not much better than no photograph.

Three ways people keep records

Paper

A notebook, or a card tucked in with each coin. Nothing to learn, nothing to break, and writing by hand means you actually looked at the coin.

The limit is that paper cannot answer questions about the whole collection. What did I spend last year? Which dates am I still missing? And it cannot hold a photograph.

Spreadsheets

The most common answer, and a good one for a while. A spreadsheet sorts, filters and adds up, which covers most of what you will want to know.

It gets awkward in one place in particular. If you own five identical silver coins and sell two, you have to decide whether to split the row or edit the quantity — and either way you lose part of the history, along with the correct cost of the three you still have.

Purpose-built apps

Software made for collections handles photos and part-sales properly, and adds up totals without you writing formulas. The thing to check before you commit is whether you can export your data, usually as a CSV file, so your records are never trapped.

Four habits that keep it accurate

Record it the day you buy it. The single most useful habit. What you know for certain on the drive home is gone within a month.

Record the total, not the tag price. Premium, shipping and grading included.

Keep it with you. A record on the computer at home does not help at a show, which is exactly where you need to know what you already own.

Check you can export it. Whatever you use, make sure you can get your data out again.

How Numistify does it

Numistify is an app built for this. Here is what it actually does, in the order you would use it.

Point your camera at the coin

Take a photo and Numistify reads what it can from the image — country, year, denomination, mint mark, composition — and fills the form in for you. You check it and correct anything it got wrong.

This matters more than it sounds. The reason most collectors stop keeping records is that typing the same fields hundreds of times is dull. Removing that step is the difference between a catalogue you keep up and one you abandon in March.

Or type it in yourself

The camera is optional. There is a normal add form for entering a coin by hand, and a bulk option for adding several at once — useful for a roll of the same date, or a lot bought together. Plenty of collectors prefer typing, particularly for coins they know well, and nothing in the app assumes you used the scan.

Templates cover the common series, so choosing one fills in the composition, weight and silver content without you looking them up.

A note on photos

Numistify reads the photo to identify the coin, it does not keep it. Your images stay wherever you took them — your phone, your computer, wherever you file them. If you want photographs as part of your record, keep them yourself and note the filename or folder in the item’s notes field.

It works out what the coin really cost

You enter the hammer price, buyer’s premium, shipping and grading fees as separate numbers, and Numistify adds them into a total cost for that coin. That is the figure it uses everywhere else, so you are never comparing a sale price against a tag price.

It handles selling part of a group

If you own ten identical silver rounds and sell four, Numistify keeps the remaining six and their cost straight, and records what you made on the four. It works out the profit in dollars and as a percentage. This is the part spreadsheets handle worst.

Every item gets its own code

Numistify assigns each piece a SKU and an item ID automatically, so two identical coins are never confused with each other. Each keeps its own purchase price, storage location and history, and when you sell one the other is unaffected.

There is also an invoice field, so several coins bought in one lot can be grouped and the whole purchase found again later.

Everything in one place

Coins, banknotes and bullion sit in the same inventory rather than three separate lists. You can record grade, grading service and certification number for slabbed coins, a storage location so you can find a coin again without opening every album, and free-text notes for anything else.

You choose which columns to show, so a beginner can work with six fields and ignore the rest until they are needed.

It runs in your browser

Nothing to install. The catalogue you built at home is the same one on your phone at a show, which is where the “do I already own this?” question actually gets asked.

Your data stays yours

Export the whole collection to a CSV file whenever you like, and open it in any spreadsheet.

The first fifty items are free and there is no card to enter, which is enough to catalogue a starter collection and see whether the habit suits you.

Questions people ask

What information should I record for each coin?

Country, year, denomination and mint mark; the total you paid including any buyer's premium and shipping; where you bought it; where you keep it; and a photograph of both sides. The mint mark and the total cost are the two fields beginners most often skip and later need.

Do I have to use the photo scan to add coins?

No. There is a standard form for typing a coin in by hand and a bulk option for adding several at once. Templates for the common series fill in composition and weight automatically. The scan is there to save typing, not to replace it.

Does Numistify store photos of my coins?

No. It reads a photo to identify the coin and fill in the details, but it does not keep the image. Keep your photographs yourself and note the filename or folder in the item's notes field if you want them tied to the record.

What is a mint mark and why does it matter?

A small letter on the coin showing which mint struck it - D for Denver, S for San Francisco, usually no letter for Philadelphia. It can be the whole difference in value. A 1916 Mercury dime from Philadelphia is common; the 1916-D is a key date, because Denver struck only 264,000.

What is a buyer's premium?

A percentage an auction house adds to the winning bid. A coin won at 200 dollars with a 20 percent premium and 15 shipping actually cost 255. Recording only the 200 makes every later calculation wrong.

Is a spreadsheet good enough for tracking a coin collection?

For a small collection, yes. Spreadsheets sort, filter and total, which covers most needs. They get awkward once you sell part of a group of identical items and need the cost of the ones you still hold to stay correct.

How do I avoid buying a coin I already own?

Keep the record somewhere you can reach at a show or a shop. A catalogue on the computer at home does not help at the moment you are deciding to buy, which is when duplicates happen.

Related guides

What to record when you buy a coin — the same fields in more detail, one at a time.

Coin collecting software: how to choose — spreadsheets, desktop programs and apps compared.

How to send coins for grading — choosing a service, and tracking coins while they are away.

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