Most vintage Swiss watches on eBay are listed at a fixed Buy It Now price, which works in your favor. You have time to study the photos, message the seller and walk away from anything that doesn't add up. Hodinkee once quoted a forum line that eBay rewards knowledge and diligence and punishes ignorance and greed. These are the things to check in every listing, roughly in the order we'd check them.
Photos of the actual watch
eBay's picture policy doesn't allow stock photos for used items. A listing that shows only catalog images or a brand's press shot isn't showing you the watch you'd receive, so ask for real photos or move on. The minimum we'd want is the dial straight on and at an angle, the sides of the case, the case back outside and in, and the movement.
The movement photo
This is the photo that matters most, because the movement is where swaps hide. The caliber number is engraved on the movement, and it should be the one the brand used for that reference. Omega's caliber 861, for example, went into other Omegas besides the Speedmaster 145.022, so finding an 861 isn't proof the movement started life in that case. Speedmaster101 recommends an archive extract for exactly that reason.
In the photo, look for a movement that sits cleanly in its case, with no forced-looking movement holder, and a case back that closes flush. If the seller won't open the back, ask whether a local watchmaker can take the photo. A listing for a valuable watch with no movement shot is giving you less to go on, and you should price it that way or pass.
The stamps inside the case back
Vintage Swiss case backs carry a reference number on the inside, and that number should agree with the dial and the movement. A few things help when you read one.
- On an Omega from 1962 on, a stamp like 145.022-69 is the reference plus a year suffix. The suffix is the year of the case design, so Fratello found Speedmasters stamped -69 that were made in early 1971. The movement serial dates the watch.
- Longines stamped a case reference inside the back. On Worn & Wound's 1954 Conquest it also appears on the back of a lug.
- IWC used separate number series for movements and cases, so the two numbers on an IWC aren't supposed to match each other. What matters is whether they match IWC's records.
Our guide to reference and caliber numbers explains each brand's system and how to date a serial.
Solid gold, gold capped, filled or plated
A listing that just says gold could mean very different watches. Solid gold is usually marked with its fineness, like 18K or 750 for 18 karat, which is 75 percent gold, or 14K or 585 for 14 karat. Some sellers can't tell the difference, so ask what's stamped on the case back and between the lugs.
- Gold capped. A thick layer of gold, around 200 microns, bonded to a steel case under heat and pressure. OmegaForums says it was used mainly in the 1960s and earlier, and often isn't marked. Look for steel showing on the case back and the back of the lugs. On pre-1962 Omegas, Fratello notes an OK prefix on the reference meant a gold-capped case.
- Gold filled. A thinner layer, around 80 microns and at least 5 percent gold by weight, often marked 14K Gold Filled or with a fraction like 1/20 12K GF.
- Gold plated. Typically about 20 microns and often marked 20M. It wears through easily.
Capped and plated watches can be lovely, but they shouldn't be priced like solid gold. Look closely at the lug tips and bezel edges in the photos for brass or steel showing through. IWC sold the Ingenieur 666 in steel and in gold, so check which one a listing actually shows.
What serviced means
Serviced is one of the most common words in vintage listings and one of the least specific. Ask who did the work, when, and whether there's an invoice. A service by a good watchmaker is a real plus, but it can also explain changed parts. Brands fitted service dials and hands during repairs, and Speedmaster101 shows 145.022 hands that look too clean to be original, probably later replacements. Ask the seller which parts were replaced. A recent service with the original dial and hands kept is worth more than one that swapped them.
Water resistance on old divers
A depth rating on a dial or case back described the watch when it was new. Wikipedia's summary of the ISO standards notes that survival underwater depends on the age of the seals and past damage, and that diving watches should be pressure tested regularly, with seals replaced at service. A sixty-year-old diver has none of that unless the seller can show it.
Treat any vintage Seamaster 300, Super Compressor or Aquatimer as not water resistant until a watchmaker has fitted new gaskets and tested it. Compressor cases, designed by the case maker EPSA, use water pressure to press the case back harder against its gasket as you go deeper. That only helps if the gasket is in good shape.
Returns and eBay's guarantee
Check the return policy, but don't assume no returns means you're stuck. eBay's Money Back Guarantee lets you return a watch that isn't as described for a refund even when the seller doesn't accept returns. The request has to be made within 30 days of delivery, or within the seller's own return window if that's longer. That protection works best when the seller's claims are in writing, so ask your questions through eBay messages and keep the answers. A seller who says the dial is original in a message has made a claim you can rely on.
Pay through eBay's checkout, too. A deal done off eBay isn't an eBay purchase, so the guarantee can't cover it.
A quick listing checklist
- Real photos of this watch, including the movement and the inside of the case back.
- Caliber, reference and dial that belong together, with a serial in the right years.
- Case material confirmed from the stamps, with no wear-through on a capped or plated case.
- Service history you can check, with replaced parts named.
- No water resistance assumed on an old diver.
- The seller's key claims in eBay messages.
For the dial itself, read how to spot a redial, and if you're new to all this, start with your first vintage Swiss watch.
