“Custom” may describe a strap swap, refinished case, replacement dial, modified movement, or an assembly built from unrelated parts. These are not equivalent.
Define what was changed
“Custom” may describe a strap swap, refinished case, replacement dial, modified movement, or an assembly built from unrelated parts. These are not equivalent.
Create a before-and-after inventory including who performed the work and whether original parts remain.
- List every replaced component
- Keep dated photographs
- Retain removed parts where lawful and appropriate
Fit is not the same as compatibility
A part may physically fit while producing incorrect clearances, hand alignment, stem geometry, sealing, or movement load. Decorative movement parts can obstruct later diagnosis.
Functional checks should cover every crown position, calendar change, chronograph action where present, and hand clearance.
- Check hand and dial clearance
- Confirm stem and crown operation
- Test functions without forcing them
Plan for service before modifying
Manufacturers may decline modified or counterfeit watches, and independent watchmakers choose what they accept. Parts of uncertain origin can make diagnosis and replacement difficult.
Water resistance must be pressure-tested after case-opening work; markings are not test results.
- Identify a willing technician first
- Budget for reversal or replacement
- Pressure-test before water exposure
Describe the result honestly
Customization does not create manufacturer provenance. A clear description separates original, replacement, aftermarket, refinished, and unknown components.
Laws differ by jurisdiction. This page is educational, not legal advice, and does not recommend buying or selling counterfeit goods.
- Never imply manufacturer endorsement
- State uncertainty plainly
- Preserve invoices and work notes
QUICK ANSWERS
Frequently asked questions
Does an aftermarket part make a watch counterfeit?
That depends on the watch, markings, representation, and local law; seek qualified legal advice for a specific case.
Can a modified watch use an authorized service center?
Policies vary and may change. Ask the manufacturer before sending it.
Is a pressure rating still valid after modification?
Do not assume so; obtain a current pressure test from a competent technician.
Sources and editorial note
This reference note uses a consistent inspection framework. Verify model-specific claims against current primary documentation and qualified independent expertise.