A checklist for buying a used watch

Almost everything that goes wrong in a second-hand watch deal was visible beforehand — in a number that didn’t match, a question the seller dodged, or a payment that left the platform. Here’s the order to work through before you pay.

Written by the developer of Loupe · Published 8 October 2026

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1. Match the numbers before anything else

Every check further down this list depends on knowing exactly which watch you’re looking at. “Speedmaster” or “Seamaster” isn’t a model — there are dozens of versions of each, with different movements, service costs and values.

• The reference identifies the model, down to the case size, material and dial variant. It’s what prices, parts and service quotes are keyed to.
• The serial identifies this individual watch. It’s the number that should match the warranty card.

Ask for photos of both, and read them yourself rather than trusting the listing title: buyer’s guides consistently warn that a listing’s description can overstate or simply misname what is being sold, so check the reference in the photo against the model in the text. Our guide to where to find a watch’s reference number covers the caseback, between the lugs, the rehaut and the papers; what the other caseback markings mean explains the rest of the engraving.

If the watch comes with a warranty card, the serial on the card and the serial on the watch must be the same number. A card that doesn’t match the watch it’s sold with is worth nothing, and papers are not proof of authenticity even when they do match.

2. What to check on the watch itself

Ask for straight-on close-ups in daylight, not flash, plus the lug tips and the caseback. Then look for these, in roughly the order that costs you money:

• Heavy polishing. On an unpolished case, the brushed flank meets the polished bevel in a crisp line. Buyer’s guides agree that repolishing rounds that transition off and thins the lugs, and that the lug tips are the most telling place to look. It can’t be undone, and on a watch where sharp original lines are part of the appeal, it moves the price.
• Non-original parts. Dealers quoted in buyer’s guides describe this as the more common problem, not outright fakes: a genuine watch carrying a refinished dial, replaced hands or a swapped bezel. It can cut what a collector will pay, sometimes sharply, and buyers often only discover it when they come to sell.
• Lume that doesn’t match. On an older watch, the markers and the hands should have aged together. Creamy markers beside bright white hands are read as a sign that something has been replaced.
• The crystal and the case edges. Scratches on the crystal are usually fixable; condensation or moisture under it is not a cosmetic issue, it means water has got in. Dents on the crown or pushers are a warning sign for the same reason.
• The bracelet. Loose or stretched links, a clasp that doesn’t hold, and whether the removed links are included — a short bracelet with no spare links is a real cost to put right.

None of this tells you whether the watch is genuine. It tells you what condition it’s in, which is a different question with a different answer.

3. Questions to ask the seller before you pay

These are the questions that recur across dealer and watchmaker buying guides. A straight answer to each is itself a good sign; a brushed-off question is information too.

1. When was it last serviced, by whom, and what was done? A full overhaul and “a regulation” are not the same thing. Our guide to how often an automatic watch should be serviced has what the brands themselves publish, so you can judge whether the answer is reassuring.
2. Can you send a recent timing result? Guides treat a timing ticket as the nearest thing to a health check on a mechanical watch — how well the movement runs, and how well it keeps time. If there isn’t one, assume you’re buying a service as well as a watch.
3. Has it been pressure-tested? The rating stamped on the caseback describes the model as it left the factory, not the state of its gaskets today. If you intend to get it wet, you want a recent test, not a number.
4. Is the dial original? Have the hands or bezel been replaced? Ask it directly, part by part, and in writing.
5. Has the case been polished? Same again. “It may have been professionally polished” in a listing means yes, and it’s worth asking how many times.
6. How many owners, and how long have you had it? A watch the seller has owned for years comes with a story they can tell. One bought last month usually doesn’t.
7. What are its flaws? A seller who can list them has looked at the watch properly. “Like new” on an obviously worn watch is the red flag every guide names.
8. What’s the returns policy, and is there a warranty? A dealer typically offers both. A private seller normally offers neither, which is part of why the price is lower.

One more, if you’re buying privately: ask for the serial and run it through a free stolen-watch register. A clean result only means the serial isn’t currently listed on that register — it is not authentication, and no register is complete.

4. Who can actually confirm a watch is genuine

Not a photo, not an app, and not a list of red flags. Authenticity is settled by a watchmaker or an authorised dealer with the watch in their hands and the case open — the movement, the finishing and the part numbers inside are where it’s decided. Loupe does not authenticate watches, and neither does any other identification tool. What our guide to telling a real watch from a fake can do is help you spot the things that are worth walking away from before you ever get that far.

On the larger marketplaces there is a middle option. As of October 2026 eBay’s Authenticity Guarantee routes qualifying watch sales through an independent third-party authenticator, who inspects the watch against the listing before it reaches you; eBay covers the cost of that inspection, and it applies above a value threshold eBay sets, in the markets where the programme runs. It is a real check by someone with the watch in front of them — which is exactly what a photo can’t be.

5. Pay in a way that can be reversed

The protections on a watch marketplace exist only inside it. Platforms of this kind hold your payment and release it to the seller after delivery, leaving you a short window to inspect the watch; the exact window, the fees and what counts as a valid claim are in each platform’s own terms, and they change, so read them before you commit rather than after.

The moment you move the deal off-platform — a bank transfer, a “friends and family” payment, cash for a watch posted to you — every one of those protections disappears. A seller who pushes for that is telling you something, and this is one risk you can remove at no cost: stay on the platform and pay the way it tells you to.

6. Budget for what the watch needs next

The asking price is rarely the whole cost. Work out, before you agree to anything, whether you’re also buying a service, a pressure test, a new strap or replacement links — and then check the asking price against what the watch is actually selling for. What a used watch is worth explains why sold prices and asking prices are different numbers, and where to look for the former. A price far below the market for a popular model is not a bargain hiding in plain sight; it is the warning sign every one of these guides names.

Know what you’re looking at before you negotiate

Loupe identifies the brand, model and, when it can see enough, the reference from a photo of the dial, with a confidence rating on every result. When it isn’t sure it lists the likely alternatives and asks for a caseback photo, and it gives an estimated resale range — not an appraisal, and not an authentication. Your collection stays on your phone. Free trial, cancel in Google Play.