Do nothing first, and mean it
This goes before the comparison because it is the advice that saves the most money and is followed the least. If you have inherited or found a watch, the single most valuable action available to you is to leave it entirely alone.
Do not have it polished. Over-polishing rounds the case edges, thins the lugs and destroys the crisp transitions collectors pay for, and it cannot be undone. Do not have it serviced before you know what it is, because a routine service may replace original parts with modern ones and a service centre may not return the originals. Do not prise the case back off yourself, because a scratched case back is permanent and a case opened badly can let dust into a movement.
Do find the paperwork. Box, papers and service records routinely account for a tenth to a fifth of a modern luxury watch's value, and looking in a drawer is cheaper than replacing them.
Over-polishing is the commonest way inherited watch value quietly disappears, and it is always done with good intentions.
Four routes, and what each settles
The important structural fact is in the last column of the first row: nothing that looks only at the outside of a watch can settle authenticity, because modern counterfeits reproduce the outside convincingly.
| Route | What it answers | What it cannot | Typical cost |
|---|---|---|---|
| A free identifier app | Maker and model family from the dial, and an indicative range for the type | The exact reference; condition; authenticity | Nothing |
| Finding the reference yourself | The exact reference and serial, which is what the market prices on | Whether the parts are original to that reference | Nothing — it is engraved between the lugs |
| An independent watchmaker | Authenticity, via the movement; condition; originality of parts; what a service would cost | A written market valuation | Often nothing for a look; a service runs into the hundreds |
| A brand service centre | The most authoritative verdict on authenticity and originality | Speed, or discretion about non-original parts — some are not returned | Varies widely; weeks to months |
| A paid authentication service | A written opinion from detailed photographs, usually including the movement | Anything without a movement photograph | Roughly $50 – 200 for a written opinion |
The reference number row is free and is the highest-value step on the list. A model name narrows a watch to a family; a reference narrows it to a price.
Why the movement is the only conclusive test
The external checks are worth running and none of them is decisive. Weight is useful because a fake often gets the alloy wrong. The seconds hand should sweep rather than tick on a mechanical piece, though better counterfeits now use mechanical movements. Engraving depth and dial printing under a loupe catch a great deal. Date alignment in the window catches more.
But all of those are surface features, and the counterfeit industry optimises for surface features because that is what a photograph and a shop-window glance assess. What it cannot economically replicate is a specific calibre with the correct finishing, the correct bridge layout, the correct jewel count and the correct markings, because that is manufacturing rather than decoration.
So a watchmaker opening the case and looking at the movement is the answer. It takes about twenty minutes, many will do it while you wait, and it is the step that ends the conversation.
Brand service centre versus independent: the real trade-off
A brand's own service centre gives the most authoritative possible answer, and for anything expensive it is the gold standard. There are two costs beyond money. It is slow, often weeks to months. And several brands will not return non-original parts they replace, which for a vintage watch can mean losing the very components that made it collectible.
That second point is not a rumour and it matters enormously on anything vintage. If a watch's value rests on an original dial, original hands or a correct-for-period bezel, sending it to the brand risks having those improved away. For vintage pieces, a specialist independent watchmaker who understands the collector market is usually the better route.
For a modern watch under warranty, or where you need an unimpeachable verdict for a sale, the brand is the right call.
- Modern watch, warranty active, need authority: brand service centre.
- Vintage watch where originality is the value: specialist independent watchmaker.
- Buying online and want a written opinion: paid authentication service.
- Just want to know what it is: the app, then the reference between the lugs.
- Always ask, in writing, for any replaced parts to be returned.
The threshold
Below a few hundred dollars of likely value, the free route is the whole answer: identify it, find the reference, look up sold listings for that reference in comparable condition.
Between that and a few thousand, a paid authentication service or a watchmaker's look is proportionate, especially if you are buying from a stranger.
Above that, have the movement seen before money changes hands, and get it in writing. At that level a seller who resists a watchmaker's inspection has told you something useful for free.