Warranties in watchmaking — the essential legal framework
The story of the ship of Theseus raises one of the most enduring dilemmas in Philosophy: over time, its planks were replaced one by one until no original part remained — and yet it was still considered the same ship; but the problem deepens when one imagines someone gathering all the old parts and using them to rebuild the original vessel — which of the two, then, is the true ship of Theseus?
Watches, too, live out their working lives between services, repairs and successive replacements of components, returning to the watchmaker time and again to keep them running; in the after-sales context, this reality raises a parallel and very concrete question: to what extent do maintenance and warranties ensure the continuity of a watch over time, and how does that continuity fit within the applicable legal regime?
We looked into the legal framework and the practice of the sector. Here we bring together the essentials for understanding — and knowing how to apply — the rules governing warranties in watchmaking.
Legal warranty vs commercial warranty
In Portugal, the main regime is set out in Decreto-Lei n.º 84/2021, which applies to relations between traders and consumers.
The legal warranty arises directly from the law and does not depend on the seller’s will. The commercial warranty (often referred to as the brand’s international warranty), by contrast, is an additional, voluntary commitment defined by the manufacturer.
It is important to stress that the commercial warranty neither replaces nor limits the legal warranty.
Buying new watches
When a trader sells a new watch to a consumer, a legal warranty of 3 years applies. During the first 2 years, any defect is presumed to have existed at the time of delivery, unless proven otherwise. This point is of great practical importance: during that period the consumer does not have to demonstrate the origin of the problem.
Faced with a lack of conformity, the consumer may demand:
Repair
Replacement
Price reduction
Termination of the contract
The choice follows a practical hierarchy: priority is given to restoring conformity, through repair or replacement.
As a rule, the repair period is 30 days, although it may be longer where there is technical justification — a frequent situation in watchmaking, owing to complex diagnosis or the need for parts.
DL n.º 84/2021, of 18 October
Article 18 - Repair or replacement of the goods
(...)
3 - The period for repair or replacement should not exceed 30 days, except in situations where the nature and complexity of the goods, the seriousness of the lack of conformity and the effort required to complete the repair or replacement justify a longer period.
(...)
Pre-owned watches
In the case of pre-owned watches sold by traders, the law allows the warranty period to be reduced to 18 months, provided there is a clear and express agreement with the consumer, usually formalised at the time of purchase. This possibility recognises the particular nature of a used item — subject to wear, previous interventions and technical uncertainties — without, however, removing the obligation to ensure its conformity with the contract. In other words, even with a reduced period, the seller remains liable for defects that exist at the time of delivery or that become apparent within the warranty period.
The distinction between a sale by a trader and a sale between private individuals is, in this context, of decisive importance. When a trader sells to a consumer, the legal warranty regime laid down in consumer law applies in full, with all the associated protections. In transactions between private individuals, however, this protection does not exist: the purchase is made “as is”, except in cases of fraud or material error. Platforms such as Vinted or similar generally fall into this second scenario, acting as intermediaries between private users; however, whenever the seller acts in a professional capacity — even within the platform — they may be regarded as a trader, with the warranty rules applying accordingly.
Warranties on repairs
Repairing a watch constitutes a provision of services, with relevant legal and technical particularities, clearly distinguishing it from the sale of goods.
In this context, the warranty does not cover the watch as a whole, but the work carried out: it covers the labour performed and the parts replaced, excluding faults other than the one initially diagnosed or those caused by external factors.
This distinction is essential, especially with complicated watches or those of unknown history, where multiple independent weaknesses may coexist.
In practice, the warranty should guarantee two fundamental points: that the fault identified has actually been resolved, and that the replaced components work correctly and durably. If the watch shows the same problem again after the intervention, there is, as a rule, a presumption that the service failed, and it is up to the professional to prove otherwise. This presumption has direct implications for after-sales management, demanding rigour in diagnosis, in execution and in the technical record of the work carried out.
The warranty period for repairs is not defined in the uniform and direct way it is for the sale of goods, which leaves some room for interpretation. Even so, in consumer relationships it tends to follow the general conformity regime, and it is recommended — and legally prudent — practice for the professional to set out clearly, in writing, the scope and duration of that warranty. Transparency on this point is decisive in avoiding disputes and ensuring a relationship of trust between customer and watchmaker.
Limitations and exclusions
There are legitimate limitations on the application of warranties, particularly relevant in watchmaking, where the mechanical nature of the objects and their sensitivity to use introduce variables that are difficult to control. These limitations include natural wear — such as the breakdown of oils, wear of pivots or the ageing of gaskets —, misuse, such as shocks, exposure to magnetic fields or improper contact with water, as well as unauthorised third-party interventions that may compromise the watch’s functioning. To these are added pre-existing defects not detected at the time of the intervention, especially in pieces with an unknown or incomplete history.
The boundary between a defect and misuse is therefore one of the main sources of dispute in this field. Determining whether an anomaly results from a technical fault, expected wear or improper use often requires specialist analysis, in which rigorous diagnosis and documentation of the watch’s condition on arrival play a decisive role. Communicating these limitations clearly, from the first contact with the customer, proves essential to aligning expectations and reducing potential litigation.
Brand warranties
Watch brands often offer commercial warranties of varying duration — typically between two and five years — and, in many cases, with international coverage. These warranties are voluntary commitments defined by the manufacturers themselves, with specific conditions governing their scope. Among these conditions, it is common to require that maintenance and interventions be carried out exclusively at authorised service centres, on pain of losing coverage, and to exclude damage resulting from misuse, such as shocks, exposure to water beyond the specified limits, or magnetism.
It is important to stress that the existence of a brand warranty neither replaces nor limits the consumer’s rights under the legal warranty. Even when the manufacturer takes on certain obligations, the seller remains liable to the consumer, under the applicable law, for the conformity of the goods. This overlap of regimes — legal and commercial — calls for careful reading by professionals and customers alike, so as to understand exactly who is responsible in each situation and under what conditions.
Estimates and transparency
When a watch is repaired, the estimate plays a central role, acting as the point where the technical analysis and the contractual framework of the intervention meet. More than a cost estimate, it should set out, clearly and rigorously, what will be done, under what conditions and with what expectations.
Good practice includes a detailed description of the planned intervention, the identification of risks — notably the possibility of additional problems arising during the process — and an indication of expected timescales, even if these are subject to the complexity of the diagnosis and the availability of parts.
In practice, the customer’s acceptance of the estimate forms the basis of the contract between the parties, defining the limits of the authorised intervention. Any significant change — whether to the work to be carried out, the costs or the timescales — must be communicated transparently and approved by the customer in advance. This procedure is not merely a formality: it guarantees clarity, trust and legal protection for both parties, especially in a technical context where the variables are not always entirely foreseeable at the outset.
Common situations
It must be acknowledged that the watch sector regularly sees cases such as watches that stop again after a service, water-resistance problems following an intervention, delays beyond the timescales initially forecast, or warranty claims refused on the grounds of alleged misuse.
Each of these situations has its own complexity that rules out automatic conclusions: a watch that stops working after a service may point to a failure in the intervention, but it may also reveal a structural problem that could not be detected in the initial diagnosis; likewise, a loss of water resistance may result from incorrect sealing or from limitations inherent in the case, especially in older pieces or those that have already been worked on many times.
Delivery delays are likewise a recurring source of tension, often linked to the difficulty of obtaining parts, the need for additional diagnosis or the workshops’ own workload. Although the law sets reference timescales, the technical reality of watchmaking — especially with complicated or vintage pieces — may justify deviations, provided they are properly substantiated and communicated. Refusals of warranty claims on the grounds of alleged misuse, in turn, place the focus on proof: it is often up to the professional to show that the anomaly results from external factors, such as shocks, magnetism or improper exposure to water.
From a legal point of view, all these situations require an integrated analysis that takes into account the content of the approved estimate, the condition of the watch on arrival, the nature of the intervention carried out and the subsequent conditions of use.
The distinction between a defect, natural wear and misuse proves central and is, more often than not, the main fault line between customer and professional.
In this context, rigorous documentation, clear communication and conditions defined in advance play a decisive role. Avoiding simplistic conclusions is not just a matter of prudence — it is a requirement for ensuring decisions that are fair, technically sound and legally solid.
Good practice
In terms of good practice, the conduct of professionals plays a decisive role in preventing disputes and in managing after-sales properly. Among the recommended procedures, a detailed record of the watch’s condition on arrival stands out, as it establishes an objective reference for future assessments, together with photographic documentation, which is essential to prove external condition and any pre-existing damage.
Written general terms and conditions that are clear and accessible also help to define the framework of the intervention, particularly with regard to warranties, timescales and limitations. On top of all this, there should be transparent and ongoing communication with the customer, especially when unforeseen issues arise or additional work is needed.
On the consumer’s side, a few simple habits can make a significant difference. Keeping proof — such as invoices, estimates and service reports — makes it possible to support any complaints or warranty claims. Always asking for an estimate before work is carried out ensures clarity as to the scope and cost of the intervention. Finally, avoiding unauthorised interventions, especially during the warranty period, is essential so as not to jeopardise rights that could otherwise be exercised in full.
The warranty regime in watchmaking calls for a balance between consumer protection and the technical reality of the object. A watch is not a disposable item: it is a mechanism subject to wear, dependent on maintenance and sensitive to use. The correct application of the law therefore depends on legal knowledge, technical competence and, above all, transparency in the relationship between the parties.
Comments