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Building a Watch using eBay Parts and Sellita SW-200 COSC Movement

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In the article “Building a Watch using eBay Parts and Sellita SW-200 COSC Movement,” you will learn the process of constructing a watch using various components acquired from eBay, including the highly regarded Sellita SW-200 COSC movement. The article outlines the specifications of the build, such as the 40mm stainless steel case, the 29mm black dial with markers at 3, 6, and 9, and the Mercedes hands with specific dimensions. The authentic chronometer certified Sellita SW-200 movement, along with other necessary parts, are also included in the discussion. The article showcases the recent purchase of the Sellita SW200 movement and further explores the available parts on an auction site for the watch-building project. It highlights the key steps involved in the assembly process, such as securing the movement in the case, fitting the hands and dial, and trimming the crown stem to the appropriate length. The article concludes by pointing out that the assembled watch performs well in terms of timing and movement and emphasizes the relatively low cost of the parts used. It also mentions the availability of a service video to aid in the construction process and hints at future projects to be featured on the channel.

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Choosing the Parts

Exploring available parts on eBay

When it comes to building your own customized watch, eBay can be a treasure trove of options. With a wide range of parts available, from cases and movements to dials and hands, it provides an extensive catalogue for watch enthusiasts to explore. By searching through the available parts on eBay, you can find the perfect components to create your dream timepiece.

Selecting a suitable case

One of the most crucial decisions in building a watch is selecting the case. It not only determines the overall aesthetics of the watch but also plays a vital role in protecting the components within. Consider factors such as size, material, and design when selecting a suitable case for your watch. Look for a case that complements your desired style and offers a sturdy construction.

Choosing the Sellita SW-200 COSC movement

The movement is the heart of a watch, responsible for its timekeeping accuracy. The Sellita SW-200 COSC movement is a popular choice among watch enthusiasts for its reliability and performance. With 26 jewels and a 38-hour power reserve, it provides reliable timekeeping and smooth operation. Additionally, the Sellita SW-200 COSC movement is COSC-certified, offering an assurance of its exceptional accuracy.

Considering the dial and hands

The dial and hands are essential components of a watch, determining its legibility and style. When choosing a dial, consider factors such as size, color, and design. A 29mm black dial with markers can provide a timeless and sophisticated look to your watch. In terms of hands, the selection of Mercedes hands can add a touch of elegance and enhance readability. Ensure that the dimensions and fitting of the hour, minute, and seconds hands are compatible with your chosen dial.

Case Selection

Specifications of the case

Before finalizing a case, it is essential to thoroughly review its specifications. Pay attention to the dimensions, as it should be suitable for your chosen movement and dial size. Additionally, consider the case material and construction, ensuring it meets your desired level of durability and aesthetics. A stainless steel case is often preferred for its corrosion resistance and timeless appeal.

Compatibility with Sellita SW-200

Make sure that the case you choose is compatible with the Sellita SW-200 movement. Check if the case has the appropriate movement holder and mounting points to secure the movement properly. Compatibility is crucial to ensure a seamless assembly process and proper functioning of the watch. Verify if the case is designed to accommodate the Sellita SW-200 COSC movement before making a purchase.

Includes stainless steel bracelet

Some watch cases come with a stainless steel bracelet included. This can be a convenient option as it ensures a matching bracelet that seamlessly integrates with the case design. A stainless steel bracelet provides durability and a polished look, adding to the overall aesthetic appeal of the watch. Consider whether the inclusion of a stainless steel bracelet aligns with your vision for the final timepiece.

Presence of solid lug strap and screw-down crown

A solid lug strap and screw-down crown are features worth considering when selecting a case. A solid lug strap offers a secure attachment for the watch band and enhances the overall durability of the watch. Additionally, a screw-down crown provides increased water resistance, making the watch suitable for activities that involve exposure to water. These features can add functionality and longevity to your custom watch.

Building a Watch using eBay Parts and Sellita SW-200 COSC Movement

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Dial and Hands

Choosing a suitable dial size

The size of the dial plays a vital role in the overall aesthetics and legibility of the watch. It should be proportional to the case size and wearer’s preference. When selecting a dial size, consider both the diameter and thickness. A balanced dial size will ensure a visually pleasing appearance and comfortable readability.

29mm black dial with markers

A 29mm black dial with markers can add a touch of sophistication and elegance to your custom watch. The black dial offers a versatile and timeless look, while the markers provide clear reference points for tracking time. The combination of size and color provides a classic aesthetic that can suit various styles and occasions.

Selection of Mercedes hands

Mercedes hands are a popular choice for watch enthusiasts due to their unique design and recognizability. Inspired by the renowned automotive brand, these hands feature a distinctive shape with an arrow-like hour hand and a lollipop-shaped minute hand. The selection of Mercedes hands can give your watch a premium and luxurious feel, elevating its overall appearance.

Dimensions and fitting of hour, minute, and seconds hands

It is essential to ensure that the dimensions and fitting of the hour, minute, and seconds hands are compatible with your chosen dial. The hands should be proportionate to the dial size, allowing for easy legibility and a harmonious visual balance. Carefully verify the specifications to guarantee a proper fit and functionality of the hands within the dial.

The Sellita SW-200 COSC Movement

Introduction to the Sellita SW-200 COSC movement

The Sellita SW-200 COSC movement is a Swiss-made automatic mechanical movement that has gained popularity in the watch industry. It offers reliable timekeeping with a frequency of 28,800 vibrations per hour and a power reserve of 38 hours. The Sellita SW-200 is known for its durability, accuracy, and ease of servicing, making it a preferred choice for watch enthusiasts.

Chronometer certification

One of the notable features of the Sellita SW-200 COSC movement is its Chronometer certification. This certification ensures that the movement has undergone rigorous testing by the Official Swiss Chronometer Testing Institute (COSC). It guarantees that the movement meets strict standards for accuracy and precision, providing reassurance to watch collectors and enthusiasts.

Absence of date window on dial

The Sellita SW-200 COSC movement does not include a date complication, which can be an advantage for those who prefer a cleaner and more minimalist dial design. The absence of a date window allows the watch dial to maintain a symmetrical and balanced appearance, emphasizing other elements such as markers and hands. Consider whether a date window is essential for your personal preference and overall design.

Recent purchase of the movement

The recent purchase of the Sellita SW-200 COSC movement ensures the availability and quality of the movement for your custom watch. By acquiring a new movement, you can be confident in its reliability and performance. Make sure to do thorough research and verify the source to ensure the authenticity and legitimacy of the purchased movement.

Assembly Process

Preparing the case for assembly

Before starting the assembly process, it is crucial to properly prepare the case. Clean the case thoroughly to remove any dirt or debris that may interfere with the assembly. Inspect the case for any imperfections or defects, ensuring that it is in optimal condition. Take careful measurements and plan the layout of the components to ensure a smooth and successful assembly.

Securing the movement using clamps and screws

To assemble the watch, secure the Sellita SW-200 COSC movement within the case using clamps and screws. Follow the manufacturer’s instructions or reference guides to ensure accurate and secure placement of the movement. Take care to handle the movement gently and avoid any damage or misalignment during the process.

Fitting the dial and hands

Next, fit the selected dial and hands onto the watch movement. Align the dial properly and secure it using the appropriate mounting points or screws. Ensure that the hands are correctly positioned and properly attached to the movement’s respective shafts. Careful attention to detail during this step will result in a well-aligned and visually appealing dial and hands.

Trimming the crown stem to the correct length

During the assembly process, it may be necessary to trim the crown stem to the correct length. This ensures that the crown operates smoothly and does not interfere with the overall functionality of the watch. Use precision tools and follow the manufacturer’s guidelines to carefully trim the crown stem without causing any damage to the movement or other components.

Performance and Cost

Evaluation of the assembled watch

After completing the assembly, it is essential to evaluate the performance of the assembled watch. Verify that the hands are aligned and move smoothly, checking for any issues or inconsistencies. Test the winding mechanism and crown function to ensure proper operation. Pay close attention to any potential issues, such as misalignment or abnormal timekeeping, and address them accordingly.

Timing and movement performance

The Sellita SW-200 COSC movement is known for its accuracy and reliable performance. Monitor the timing accuracy of the assembled watch to ensure that it meets your expectations. It is advisable to compare the watch against a known accurate time source regularly. If any adjustments are necessary, consult a professional watchmaker or follow the manufacturer’s instructions to fine-tune the movement.

Overall cost of the parts

The overall cost of building a custom watch using parts from eBay can vary depending on the specific components chosen. Consider the cost of the case, movement, dial, hands, and any additional accessories or tools required for assembly. Calculate the total cost of all the parts involved to get an accurate estimate of the project’s expenses.

Relative affordability of the eBay parts

One advantage of sourcing watch parts from eBay is the potential for cost savings. Compared to purchasing pre-built watches from traditional retailers, building a watch from eBay parts can be a more affordable option. However, it is essential to exercise caution and thoroughly research the sellers and the authenticity of the parts to avoid counterfeit or low-quality components.

Assistance and Resources

Availability of service video for guidance

Building a custom watch can be a complex task, especially for those with limited experience. Fortunately, there are various resources available, including service videos, that provide step-by-step guidance on assembly techniques and troubleshooting. These videos can be an invaluable source of assistance, offering visual instructions and tips to ensure a successful build.

Additional projects on the horizon

Once you have completed your custom watch, it may spark a newfound passion for watchmaking. Consider exploring additional projects and expanding your skills and knowledge in this field. Building more watches can provide a rewarding and creative outlet, allowing you to further explore your personal style and preferences.

Access to further assistance and information

Building a custom watch requires a certain level of expertise and technical knowledge. If you encounter any challenges or have specific questions, it is advisable to seek assistance from professionals or experienced watchmakers. Online forums, watch enthusiast communities, and specialized watchmaking resources can provide access to additional assistance and information.


Building a custom watch using parts available on eBay allows you to create a timepiece that reflects your unique style and preferences. By carefully selecting the case, dial, hands, and movement, you can build a watch that meets your desired aesthetics and performance standards. The Sellita SW-200 COSC movement offers reliability and accuracy, while the choice of a black dial with Mercedes hands adds elegance and sophistication. With proper assembly and evaluation, your custom watch can become a cherished timepiece that brings pride and satisfaction for years to come. Remember to utilize available resources and seek assistance when needed to ensure a successful assembly process.

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