Find the reference without guessing.
Start with the purchase record or manufacturer documentation. A collection name alone can cover several case sizes, movements and materials. Record the reference exactly as shown, including letters and suffixes. If the reference is uncertain, keep that uncertainty attached to the record instead of choosing the closest-looking expensive version.
A serial number identifies an individual watch; a reference identifies a model or variant. Keep full serials and personal details from receipts out of public photos. Do not open the case or remove parts just to identify a watch. If the accessible markings and documents disagree, a qualified watch professional can help resolve the identity.
Write a comparison description.
Use one description consistently across your research. Include the verified reference, dial color, case material and size, bracelet or strap, visible condition, and included accessories. Record the year only if you have evidence for it; a purchase date does not necessarily establish the production year.
- Dial and hands: note visible differences rather than assuming all examples of a reference are identical.
- Bracelet and fit: distinguish a bracelet from a strap and record whether spare links are included.
- Condition: photograph scratches, dents and damage honestly. Unknown mechanical condition should remain unknown.
- Box and papers: record what is actually present. A generic replacement box is different from the original set.
Chrono24’s valuation guide asks for reference and condition information, including box and papers. Its estimate is another piece of context; it does not establish what a particular buyer will pay you.
Keep different kinds of prices in different groups.
Dealer listings, private listings, completed sales and trade-in offers answer different questions. A dealer ask may include services or protections your own sale would not. A trade-in offer is an offer to you, while a public asking price is a seller’s target. Do not average them together and call the result a completed-sale value.
For every comparison, keep the URL, observation date, currency, reference, condition, accessories and price type. Exclude another metal or reference even when the headline uses the same model name. If all you can find are active listings, label the result an asking-price range.
A worked comparison without invented market quotes.
Your sample watch is reference EX-38 in steel, with a blue dial, bracelet and papers but no box. Three visible listings ask $1,100, $1,250 and $1,400. The first two match those details; the third is a different case material. Retain the first two as an observed $1,100–$1,250 asking range, exclude the third, and state that you have no verified completed-sale evidence.
If your actual purchase cost was $900, that asking range does not prove a profit. Only an eventual sale, less your actual selling expenses and purchase cost, establishes the realized result. Use the resale profit calculator when you have those amounts.
Keep the record useful as the watch changes.
Revisit comparisons when you intend to sell or when the watch’s condition or included accessories change. Retain the original purchase cost and the date of each estimate. No matching evidence is an unresolved value, not a zero-value watch.
The Pieces watch collection tracker keeps your collection and available market evidence together. Pieces is an iPhone app currently awaiting public launch; the website waitlist is available now. A collection estimate is not authentication, a professional appraisal or a guaranteed selling price.
Building a complete collection record? Start with how to track your closet’s value, then use this guide for the details.