Published: 31 July 2026 by Dan Williams
Part of: Notes on eBay Discovery & Selling / From the Seller’s Workbench
Search for stamp catalogue value vs selling price, or Stanley Gibbons catalogue value vs eBay price, and you hit the same thing fairly quickly. The catalogue gives a figure. The market won’t always agree with it.
That can look strange, especially on eBay. Same SG number, very different prices. One seller may ask close to catalogue value. Another may sell what looks like the same stamp for a fraction of it. Some prices are sensible. Some are optimistic. Some are bargains. Some listings just haven’t found the right buyer.
This is a short look at why that happens, based on how I think about pricing and listing stamps for Apollo’s Lots Stamps. It covers catalogue value, condition, demand, eBay asking prices, completed sales and lower-value stock.
Stamp catalogue value is only a guide
Catalogue value is useful and I use catalogues all the time. They help identify the stamp, check the issue, find the correct catalogue number and understand how one stamp compares with another.
For Great Britain material, a Stanley Gibbons catalogue value can give a useful guide to relative scarcity or importance. It can also help separate a common stamp from a better shade, watermark, flaw or listed variety.
But the catalogue doesn’t price the exact stamp in front of you. It doesn’t know the centring, gum, cancellation, perforations, faults, eye appeal, current demand, or how many similar examples are already for sale.
It’s also worth noting that Stanley Gibbons values are effectively a retail price list for prime stock, not a neutral summary of secondary market clearing prices across eBay or auction houses.
So I treat catalogue value as part of the picture, not the answer on its own.
Why stamps often sell below catalogue value on eBay
Many stamps sell below catalogue value because the real market has to take account of condition, demand, availability, seller trust, presentation, postage and timing.
A catalogue may list a stamp at a certain value, but not every example deserves that price. A stamp with heavy cancellation, pulled perforations, a thin, a crease, toning or poor centring isn’t the same as a fresh, clean, well-centred example.
This is especially true with classic Great Britain stamps. A Queen Victoria surface-printed stamp in good to average-fine condition might sell for 10–20% of catalogue value in many cases. A truly superb example, with strong colour, good centring, clean condition and an attractive cancellation, may get much closer to full catalogue value.
A real rarity, or an exceptional example of something genuinely difficult to find, may even exceed catalogue value.
Those percentages aren’t a rule. They’re just a rough example of how wide the gap can be between catalogue value and selling price.
How stamp condition dictates actual selling price
Two stamps can have the same SG number but very different values.
One might be off-centre with a blunt corner and heavy postmark. Another might be fresh, clean, well-centred and neatly cancelled. Technically, they may be the same stamp. In practice, they’re very different buying propositions.
For mint stamps, gum condition is a major part of the assessment. Unmounted mint, mounted mint, mint no gum, disturbed gum and regummed examples shouldn’t be treated as equal.
For used stamps, the cancellation can make a big difference. A heavy parcel cancel isn’t the same as a neat circular datestamp. A clear, well-placed postmark can sometimes make a used stamp more desirable, especially if the cancellation is collectable in its own right.
I have a separate guide to the terms I use in listings here: stamp grades and philatelic abbreviations.
Scarcity and demand are not the same
A stamp can be scarce and still slow to sell.
That sounds odd, but it happens. Some stamps are genuinely difficult to find, yet only a small number of buyers are looking for them at any given time. Other stamps are much easier to find, but have a bigger pool of active collectors watching for better examples.
This is where catalogue value can mislead newer collectors. A high catalogue value may point to scarcity, but it doesn’t automatically prove strong current demand.
The opposite can also happen. A lower-catalogue item may sell well if it has something extra: a superb postmark, unusual usage, attractive appearance, a scarce shade, a useful cancellation, or simply strong collector interest at that moment.
The asking price trap: current listings vs. real value
Current eBay listings are useful, but they need a bit of caution.
An asking price isn’t a sale price. A stamp listed at £50 hasn’t sold for £50. It may sit there for months. It may be reduced. It may never sell.
Current listings are still worth checking because they show availability. If there are twenty similar examples already listed, that affects the pricing picture. If there are none, that can be useful to know as well.
But current listings only show what sellers are asking. They don’t show what buyers have actually paid.
Completed eBay sales need context
Completed sales are usually more useful than current asking prices because they show real transactions.
Even then, they need context. Was it an auction or Buy It Now? Was the title clear? Were the images good? Did the seller have strong feedback? Was postage included? Was the stamp properly identified? Was the condition genuinely comparable?
A weak listing can sell too cheaply. A clear listing can sell strongly. A badly timed auction can underperform. A fixed-price listing may take longer, but reach the right buyer.
So I don’t use completed sales mechanically. They’re evidence, not an automatic answer.
Stanley Gibbons catalogue value and eBay price
For British stamps, Stanley Gibbons catalogue numbers and values are still very useful. They give collectors a shared reference point.
In Apollo’s Lots listings, I normally include the SG number where relevant because it helps buyers identify exactly what is being offered. It also makes comparison easier, especially with shades, watermarks, flaws, and varieties.
But the eBay price still has to be judged against the actual item. Catalogue number first. Then condition, demand, availability and recent sales evidence.
I have written more about the catalogues, references and tools I use on the Apollo’s Lots site: Stamp Catalogues, References & Tools I Use.
How I price stamps for Apollo’s Lots
When pricing stamps for Apollo’s Lots, I usually look at a mix of things:
- catalogue value;
- condition and eye appeal;
- my own previous sales;
- current eBay listings;
- completed eBay sales;
- Terapeak where useful;
- how easy or difficult the item is to replace;
- whether the item is common stock, specialist material or something more unusual.
I don’t always aim to be the cheapest. The cheapest listing isn’t always the best comparison. Poor images, vague descriptions, weak condition notes or uncertain identification all reduce buyer confidence.
For ordinary material, I may price close to the lower end of sensible comparable listings. For scarcer, cleaner or more specialist material, there’s more judgement involved.
Low-priced stamps are not always low-value stock
Low-priced stamps can look unimportant if you only judge them by margin on one sale.
But small items can still do useful work. They can bring someone into the shop, help build a combined order, give a buyer confidence, or lead to a later purchase. A £1 or £2 stamp isn’t always just a £1 or £2 stamp.
I have written about that idea separately here: Why a £1 Stamp Can Be More Valuable Than a £50 Stamp.
This is another reason catalogue value is only part of the picture. A stamp can be low value in catalogue terms but still useful stock. It may fill a gap, complete a set, help a buyer combine postage, or introduce them to a seller they later return to.
Listing quality can affect the final price
Presentation counts; and a clear scan, accurate title, correct catalogue number, and honest condition notes all help the buyer make a decision.
That doesn’t make a common stamp rare. But it can be the difference between a buyer trusting one listing and scrolling past another.
I have written more about how I structure eBay listings here: The Anatomy of My eBay Listings.
A simple way to think about stamp value
If I had to reduce it to one line, I’d put it like this:
Catalogue value gives the ballpark. The actual stamp does the rest.
The catalogue number is useful. The listed value is useful. But condition, demand, appearance, market evidence, seller trust and timing all change the final picture.
That’s why one stamp may sell for a small percentage of catalogue value, another may get close to full catalogue, and a rare or exceptional example may exceed it.
For current Apollo’s Lots stock, see the Apollo’s Lots Stamps eBay store.
— Dan Williams
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This note is part of From the Seller’s Workbench: practical notes from listing and selling specialist GB stamps on eBay.
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You can also read the wider Notes on eBay Discovery & Selling hub, including the eBay Discovery Notes series.