What clients say
Accounts from owners who have used the workshop
The following accounts reflect the range of work carried out at siamchra — from assessment through full service to complication recalibration.
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Watches serviced
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Client accounts
What owners have written
Somkiat Kliangklao
Bangkok · Watch collector
"Brought in a Seiko 6105 that had been running erratically since I bought it at auction. The diagnostic report was clear and honest — it identified worn keyless works and a mainspring showing early fatigue. The report was detailed enough that I understood exactly what the options were before I committed to anything. Went ahead with the full service. The watch came back regulated to around +4 sec/day, which is better than the original spec."
April 2025 · Full Service
Pattara Thirawut
Chiang Mai · Engineer
"I had a Valjoux-based chronograph with a sticky reset — it would reset but the hands were landing slightly off zero. The complication recalibration service addressed exactly that. The technician explained the mechanism clearly before starting work and confirmed the price. After the observation period, the chronograph resets cleanly. The short performance report they provided is a useful document to keep with the watch."
March 2025 · Complication Recalibration
Nattaporn Wongpan
Bangkok · Architect
"Used the diagnostic report service for a pre-owned Rolex I was considering. The report was thorough and gave me a realistic picture of what the movement needed. The watch turned out to need more work than the seller had suggested, which helped me negotiate. The report took about a week to prepare, which was slightly longer than I expected, but the quality of the written assessment made the wait reasonable."
April 2025 · Diagnostic Report
Kamolwan Srisai
Bangkok · Medical doctor
"My grandfather's Omega Seamaster had not been serviced in over twenty years. siamchra was straightforward about what to expect — significant wear in certain areas, some parts that would need replacement. The report came with photographs I had not expected, showing the actual state of the components. The full service took four weeks. The watch now keeps time reliably and the pressure test confirmed the case seals are holding."
February 2025 · Full Service
Thanawat Chaiyasit
Bangkok · Finance
"The GMT complication on my watch was jumping the wrong way after a few months of ownership. I did not know if it was a wear issue or a setting I had missed. The recalibration service included a fault trace — turned out to be a worn detent spring in the jumping mechanism. The part was sourced and replaced. The observation cycle they describe in the service outline is real; they kept the watch for five weeks before returning it. Worth it."
March 2025 · Complication Recalibration
Arunporn Petcharat
Nonthaburi · Teacher
"I used the diagnostic service before deciding whether to service an Orient I had found at an estate sale. The report identified a crack in the balance staff and light corrosion on several components. Based on that, I decided not to proceed with a full service — the piece was not worth the cost relative to its sentimental value. The report gave me what I needed to make that decision without pressure. A sensible service for what it is."
April 2025 · Diagnostic Report
Case studies
Three detailed service accounts
Vintage Seiko 6139 Chronograph — Full Rehabilitation
The situation
A 1974 Seiko 6139 purchased abroad had stopped running entirely within six weeks of arrival. The owner suspected water ingress from the crown area but could not confirm without opening the case.
The work
Diagnostic report first: confirmed water damage to the mainspring and partial corrosion on two bridge components. Owner approved full service. Mainspring replaced, corroded parts cleaned where recoverable. The chronograph column wheel required a replacement sourced from an approved parts supplier — this was confirmed with the owner before sourcing.
The result
Watch returned after 4 weeks. Rate measured at −2 sec/day. Chronograph function restored. Pressure tested to 3ATM. Owner has continued to use it daily for the months since collection.
Duration: 4 weeks · Services: Diagnostic + Full Service
ETA 2892-based Annual Calendar — Recalibration
The situation
The date disc on an annual calendar module had started advancing at incorrect intervals — jumping twice some nights and not advancing on others. The main timekeeping remained accurate, suggesting an isolated complication issue.
The work
Complication recalibration service engaged. The annual calendar module was isolated and inspected. The issue was traced to a worn instantaneous date cam causing inconsistent engagement. The cam was replaced from approved spares. The module was recalibrated and observed over 12 days across different daily-wear simulation conditions.
The result
Calendar module advancing correctly across all months observed during the verification period. Performance report included dates of observation, behaviour at each midnight, and the corrective action taken. Watch returned at week five.
Duration: 5 weeks · Service: Complication Recalibration
Pre-purchase Assessment — Tudor Black Bay GMT
The situation
A buyer was considering a privately listed Tudor with service papers from 3 years prior. The seller could not provide evidence of how the watch had been used. The buyer wanted an independent assessment before committing to the purchase price.
The work
Diagnostic and condition report engaged. Movement opened and inspected. Report documented current lubrication state (still adequate), evidence of moderate wear consistent with regular use, and no signs of impact or moisture ingress. GMT mechanism inspected and found to be functioning correctly. Report delivered with photographs.
The result
Buyer received an independent, documented basis for the purchase decision. The report confirmed the watch was in reasonable condition and that a service was not urgent — providing negotiating clarity. No service was required at this stage.
Duration: 6 days · Service: Diagnostic Report only
Workshop contact
Contact details
Address
89 Si Lom Road, Bang Rak
Bangkok 10500
Hours
Mon–Fri: 09:00–18:00
Sat: 10:00–15:00
Credentials
Professional standing
Horological Society of Thailand
Member since 2013. Active participation in professional watchmaking development in Thailand.
Swiss Foundation Training Certificate
Lead technician completed formal watchmaking training through a Swiss-affiliated programme covering movement servicing and complication work.
PDPA Data Protection
Customer data handling complies with Thailand's Personal Data Protection Act. Owner information is used only for service communication.
Get in touch
Ready to arrange a service?
Contact the workshop to discuss your piece. The diagnostic report is a sensible starting point if you are uncertain which service applies.