About the workshop
A workshop built around patient, methodical work
siamchra was established to offer Bangkok's watch owners a place where the piece is treated with the same care as the owner would treat it — without rushing, without assumptions.
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siamchra, since 2011
The workshop opened on Si Lom Road in 2011, in a district where small specialist trades have operated for generations. The founding intention was narrow and deliberate: to provide watch servicing to the standard that an owner might expect from an authorised facility, but without the constraints of a branded service centre.
In the early years, the work focused on Japanese automatics — calibres that were well-documented and for which approved materials were straightforwardly available. Over time, the scope widened to include mainstream Swiss and German calibres, and later the complication recalibration service for pieces with chronograph, GMT, annual calendar, and moonphase modules.
The practice that has remained constant since the beginning is written documentation. Every watch that enters the workshop leaves with a record of what was found and what was done. That record is the owner's property, not the workshop's.
Mission
To carry out watch servicing at a standard the owner can verify — through written reports, transparent pricing, and work that proceeds only with explicit approval.
Philosophy
The decision of what to repair, what to replace, and what to leave unchanged belongs to the owner. The technician's role is to provide the information needed to make that decision well.
Location
The workshop is at a permanent address in Silom. Owners are welcome to visit, to discuss a piece before bringing it in, and to collect in person. There is no courier-only arrangement.
The people
Workshop team
Each technician at siamchra works across specific service types matched to their training and experience.
Prayuth Tantiworakul
Lead Technician
Trained in Switzerland and working with mechanical calibres since 2004. Handles full service work and complication recalibration across Swiss and German movements.
Naphatson Sriwong
Diagnostic Technician
Specialises in condition assessment and Japanese calibre work. Produces diagnostic reports and manages the first stage of all incoming service requests.
Wanlapa Kanchana
Workshop Coordinator
Manages scheduling, owner communications, and documentation. Coordinates between the workshop and owners throughout each service period.
How we work
Workshop standards
Controlled work environment
Movements are opened in a filtered workspace. Dust and particulate contamination during disassembly is managed through environmental controls rather than relying solely on post-cleaning.
Photographic documentation
Key components are photographed before cleaning and after reassembly. These images form part of the condition report provided to the owner with each returned piece.
Calibre-specific lubricants
Lubrication choices are matched to each calibre's technical specification. The workshop maintains a range of watch-grade lubricants used at quantities that follow manufacturer guidance.
Pressure testing
Water resistance is verified after case reassembly on all full service work. The test result is recorded and noted in the written service summary returned with the watch.
Approved spare parts
Replacement parts used in service work are sourced from authorised supply channels where available. Non-standard substitutions are noted in the service report and require explicit owner approval.
Owner data and confidentiality
Contact information provided during the service process is used only for communication related to the specific service. Data is not shared with third parties and is held in accordance with applicable data protection practice.
Expertise and values
What watch servicing in Bangkok should look like
Bangkok has several options for watch servicing, from department store counters to specialist independent workshops. The difference between them lies in what happens after the caseback is removed. At siamchra, the emphasis is on informing the owner before the work begins, not after it is complete.
The diagnostic and condition report service was established specifically to address a common concern: owners who have received a service quotation without a clear explanation of what condition the movement is actually in. The written report changes that dynamic. It gives the owner the information needed to decide whether full service is appropriate, whether it should be deferred, or whether a second opinion is warranted.
For modern automatic watches, the full service follows a defined sequence: disassembly, ultrasonic cleaning of components, lubrication using calibre-appropriate materials, replacement of standard wear parts where needed, regulation across multiple positions, and pressure testing after case reassembly. The work is thorough because the aim is to restore the watch to a state where it can be used with confidence, not simply to address a single presenting symptom.
The complication recalibration service addresses a narrower problem: a watch whose main timekeeping is acceptable but whose chronograph, GMT, calendar, or moonphase function has drifted from specification. The recalibration work traces the mechanical cause, corrects it, and verifies the result over a period of observation before the piece is returned.
The workshop is at a fixed address in Silom, accessible without appointment for drop-off and collection during workshop hours. This is deliberate. A watch entrusted to a technician should be retrievable in person by the owner, not held at an unspecified location somewhere in a logistics chain.
Ready to begin
Bring the piece in for assessment
The diagnostic report is a reasonable starting point for any watch that has not been serviced recently or that has shown a change in behaviour. Contact us to arrange a time to bring the piece in.
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