Timing Diagnostics
We measure rate, amplitude, and beat error across multiple positions to show how the movement is behaving.
EnquireWatch calibration Hertfordshire
Precision You Can Measure, Documentation You Can Trust
A valuable watch deserves clear evidence. Accorn Chronos Ltd measures timing performance, checks mechanical condition, and records the details that matter for insurance, resale, auction, and pre-purchase verification.
Every report is written by a qualified horologist, not generated by software alone.
Multi-position timingRate, amplitude, and beat error
Clear written reportsUseful for decisions and records
Appointment basedPrivate, careful, and secure
Measured care
What We Offer
Each service answers a practical question about your timepiece. Results are discussed in plain English.
Regulation
Fine adjustment brings the watch closer to its best daily accuracy where the movement and condition allow.
EnquireAccuracy Testing
Extended testing checks stability across different positions and gives a more useful picture than one reading.
EnquirePerformance Optimisation
We identify practical steps that may improve timing consistency without recommending work the watch does not need.
EnquirePost-Repair Testing
After servicing or repair, testing confirms how the watch is running before it returns to your wrist.
EnquireCondition Reports
Written and photographic records support insurance reviews, private sales, auctions, and purchase decisions.
EnquireWhat Goes Into a Condition Report?
A comprehensive report protects you in any transaction. Every observation is tied to the watch in front of us.
Case conditionScratches, dents, polishing history, and signs of originality are recorded.
Dial and handsPatina, restoration evidence, and originality receive close visual attention.
Movement conditionVisual findings, timing results, winding, setting, and functional observations are included.
Bracelet or strapWear, stretch, fastening, and originality notes help establish the complete condition.
Water resistanceWhere appropriate, testing results and case integrity findings are stated clearly.
Photographic documentationHigh-resolution images capture significant details for your records and discussions.
A useful second opinion
Who Uses These Services?
Good information changes the next decision. Start with evidence.
Collectors
Check timing performance before adding a watch to a carefully built collection.
Insurance Clients
Keep documented condition details ready for a coverage review or valuation discussion.
Sellers
Give prospective buyers a clear record of the watch before a private sale or auction.
Buyers
Use a pre-purchase watch inspection to identify undisclosed issues before payment.
Dealers and Auction Houses
Bring in external timing and condition evidence when a listing needs technical support.
Authentication Support for Vintage and Collectible Pieces
Vintage watches carry details that need careful comparison. We provide technical authentication support for private sale, auction, and insurance decisions.
Movement and case serial numbers checked against known references.
Dial, hands, and crown assessed for originality.
Movement architecture and finishing reviewed for period correctness.
Findings documented for a private transaction or formal discussion.
We provide technical authentication support. For formal third-party certification, we can recommend trusted partners.
Clear timing, clear next steps
Fast, Documented, and Discreet
All work requires a booked appointment for security and efficiency. Tell us what you need checked when you get in touch.
Calibration visit: 30–60 minutes
A same-day written timing summary gives you the core results before you leave the workshop.
Condition report: 3–5 business days
Comprehensive documentation takes time because photographs and observations are checked carefully.
Pre-purchase inspection: 2–3 business days
Full assessment covers timing, visible condition, movement observations, and practical concerns.