What is your stamp
actually worth?

Why the catalogue price
is almost never the real price

Every serious collector has a copy of Stanley Gibbons, Michel, AFA or Scott on their shelf. These catalogues are invaluable reference tools — but there is one thing they are consistently poor at: telling you what a stamp is actually worth on the open market.

Stamp catalogues set their prices based on theoretical retail value from specialised dealers, not on actual transactions between buyers and sellers. The methodology has barely changed in a century. Meanwhile, the stamp market has fragmented, globalised and moved online — and real trading prices have drifted far from what the catalogues suggest.

This is not a flaw in the catalogues — it is simply what they are designed for. A catalogue price is a ceiling, a reference point, a shared language between collectors. It is not a price tag.

Stamps are priced
like art

The market for stamps behaves remarkably like the market for art. Price is not set by cost of production or theoretical value — it is set entirely by what a willing buyer will pay a willing seller at a given moment.

A 19th-century definitive from Greenland might carry a catalogue value of 800 DKK, yet struggle to sell for 80 DKK because there are thousands of them in used condition and few collectors actively seeking them. Conversely, a seemingly minor variety — a shifted overprint, an imperforate pair, a rare colour shade — can command multiples of catalogue value when two determined collectors decide they must have it.

The key drivers of real stamp market value are:

• Condition — centring, perforations, gum, cancellation quality
• Rarity — genuine print runs, survival rates, known examples
• Demand — active collector communities for that country or period
• Provenance — collection history, expert certificates, pedigree
• Timing — auction competition, market cycles, seasonal interest

None of these factors are captured in a catalogue price. All of them are reflected — eventually — in actual market transactions.

Why pricing has always been opaque — until now

For most of philately's history, accurate price discovery required either years of market experience, access to auction archives, or a network of dealer contacts. The knowledge was locked up in specialists' heads.

A new collector inheriting a collection had almost no way to know whether the stamps were worth hundreds or hundreds of thousands. They either relied on a dealer's assessment (with inherent conflicts of interest) or guessed from catalogue values — which, as we have seen, could be wildly misleading.

This opacity has suppressed the stamp market for decades. Collections sit unsold in attics. Potential buyers are put off by uncertainty. Sellers undervalue or overprice their stamps and find no takers. The result is a market far less liquid than it should be.

AI valuation in four steps

Stamporo uses Claude — Anthropic's state-of-the-art AI — to identify, classify and value stamps from a single photograph.

Freeing the stamp market

Stamporo's mission is simple: make the stamp market as transparent and liquid as possible. AI valuation is the key that unlocks this.

When every collector — novice and expert alike — has instant access to realistic price expectations, transactions complete rather than stalling in uncertainty. Collections that have sat in drawers for decades finally find new homes.

Each transaction recorded on Stamporo feeds back into the price data, making future estimates more accurate. Over time, Stamporo builds a real-time, community-sourced index of actual stamp trading prices — something the philatelic world has never had before.

Frequently asked questions