Identify what is actually missing
Separate the presentation box, warranty card, sales receipt, service records, spare links and reference-specific accessories. Each item supports a different part of the buyer's decision.
Start with the watch itself
Reference accuracy, ownership context, case condition, dial, movement and bracelet remain the core evidence. A full set cannot repair a questionable watch, and a watch-only example can still be a valid transaction.
Expect the discount to vary
Highly collected, recently produced and configuration-sensitive watches often reward completeness more than ordinary well-used references. Do not apply one universal percentage across brands and eras.
Replace missing confidence with evidence
Provide clear watch photographs, a partially covered serial-area view, service documents, original purchase context when available and a transparent explanation of what happened to the accessories.
Choose the route that can inspect
A direct buyer or established consignee may handle a watch-only example more efficiently than an anonymous private listing. Compare the lower expected proceeds with the security and inspection process you receive.