Full documentation add a definite premium in the secondary market. Original papers confirms original retail sale and supports provenance. Missing documentation does not indicate automatically suspect, although it commands reduced value.
The secondary watch market delivers entry to references that are discontinued or audemars piguet royal oak allocated. Verifying authenticity is the critical step. Serial and reference numbers need to align with papers. Service history bears on value and reliability.
Fine mechanical timepieces need periodic servicing if they are to remain reliable. Recommended periods range by manufacturer, usually falling between five and ten years. Overhaul includes complete disassembly and rebuild. Running a watch too long between services can cause expensive repairs.
What a watch holds ranges widely between brands and references. Steel sports models from the major leading makers frequently trade above retail, while precious metal dress watches usually trade below retail. Box, papers and condition govern value within a reference.