To start collecting, consider a budget that includes possible assessment and servicing: this is advice, not a guarantee of availability or value.
Request the reference, available documents and service history.
Photographs, a box, papers and apparently correct operation do not alone establish authenticity, component originality or internal condition; if in doubt, seek assessment from the manufacturer or a qualified professional.
COSC distinguishes instrument categories and testing protocols. COSC — certification criteria
Its page describes an average daily rate criterion of −4 to +6 seconds for tested mechanical watches; this is not a rule for every certification or a guarantee of current wrist performance or whole-watch authenticity. COSC — certification criteria
COSC notes that performance can change and documents are not always supplied to buyers. COSC — certification criteria
Missing service history is a reason to request a diagnosis and quote, not to assert that servicing is necessary.
Before immersion and for care or storage, consult the manual and have the watch’s condition assessed. Seiko — water resistance
Check sale, return and warranty terms in writing: their existence alone does not authenticate a watch.
Collecting advice
These suggestions are advice, without guarantees of availability, value or protection. Request sale, return and warranty terms in writing. For storage and what to do if a watch stops, consult its manual and, if in doubt, a professional. Seiko — water resistance
Choose according to your preferences and budget; request model-specific service availability and a quote.
Frequently asked questions
Which watch should start a collection?
Choose according to your preferences and budget; request model-specific service availability and a quote.
Do a watch's papers matter?
Photos, papers, a box and invoices are evidence to assess, not authentication or proof of internal condition.
Should a pre-owned watch be serviced after purchase?
Request a diagnosis and quote; missing history does not prove that servicing is necessary.