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Cyma is a name that makes knowledgeable collectors sit up and pay attention. Founded in 1862 in Le Locle by the Schwob family, Cyma was for decades one of Switzerland’s most respected and prolific manufacturers, producing everything from elegant dress watches to robust military-specification pieces. During both World Wars, Cyma supplied watches to multiple armed forces, and their movements were widely recognized for reliability and precision. The Watersport line, in particular, represented Cyma’s answer to the growing postwar demand for robust, water-resistant automatic watches that could handle an active lifestyle without sacrificing everyday wearability. It was a proper tool watch from an era when that term actually meant something.
What makes the Watersport especially interesting to collectors today is its bumper automatic movement. The Cal. R420 is a fantastic example of this transitional technology, produced during that fascinating period in the late 1940s and 1950s when the industry was still perfecting the full-rotor automatic. In a bumper movement, the oscillating weight doesn’t spin a full 360 degrees. Instead, it travels back and forth within a limited arc, bouncing off spring-loaded buffers at each end of its travel, hence the name “bumper.” The result is a distinctive tactile sensation on the wrist, a gentle back-and-forth momentum that you can actually feel, and that many collectors find addictive. It’s a mechanical experience that simply doesn’t exist in modern watchmaking, and that alone makes these movements special. Cyma’s version, running on 17 jewels with lovely rose gold-toned finishing on the plates and rotor, is a beautifully crafted example of the type.
This particular example is an honest survivor with real character. The dial has developed a beautiful warm ivory patina over the decades, with fine scattered speckling that gives it an almost organic, parchment-like quality. It’s the kind of aging that can’t be faked and that tells you this watch has been living its life. The applied metal Arabic numerals and arrow indices retain their original luminous fill, which has aged to a rich golden hue that harmonizes beautifully with the dial’s warmth. The bold dauphine hands carry the same aged lume, and the overall effect is a watch that feels cohesive and naturally elegant in its patina. The “CYMA” lettering in applied metal above center remains crisp, and the “Automatic WATERSPORT” printing below is fully legible and intact.
The stainless steel case is in solid, honest condition. The faceted lugs retain their angular definition, and while the case band shows the kind of honest surface wear you’d expect from a watch of this era, it hasn’t been aggressively polished or reshaped. The caseback carries a personal engraving in handsome Old English script reading “R.W. Weldon,” a lovely piece of provenance that connects this watch to its original owner. The inner caseback is stamped with the Cyma Watch Co. crest, “Swiss Made,” “Stainless Steel,” and the case reference 2.1221.6 with serial number 964. Remove the caseback and the Cal. R420 reveals itself in all its rose gold-toned glory, the bumper rotor clearly visible alongside the beautifully finished bridges and plates.
For the collector who wants something genuinely different on the wrist, this Cyma Watersport delivers in a way that few watches at any price can. The bumper automatic movement provides a mechanical experience that is tactile and engaging, the kind of thing that makes you aware you’re wearing something alive. Paired with that wonderfully aged dial and its connection to a storied Swiss manufacturer with serious horological credentials, it’s a watch that offers tremendous depth for the money, a piece with history, character, and a story already engraved into its back.
