Cyma Navystar – Automatic Bumper – Cal. 420 – 1950s – Swiss Vintage A fine and authentic vintage wristwatch by Cyma, part of the well-regarded Navystar line, featuring an early in-house automatic “bumper” movement, calibre 420. Produced in the late 1940s to early 1950s, this model represents an important stage in the evolution of automatic watchmaking. The calibre 420 is Cyma’s first automatic movement, operating with a bumper rotor system that oscillates between springs rather than rotating fully, offering a distinctive mechanical character appreciated by collectors. The watch features a gold-plated case combined with a stainless steel case back, consistent with period manufacturing standards. The case measures approximately 32 mm excluding the crown, maintaining the elegant proportions typical of vintage dress watches. The original dial, with Arabic numerals and the Cyma Navystar signature, shows natural ageing and patina, adding authenticity and vintage character. The hands appear original and correct for the period. The case back is engraved “Cymaflex – Waterproof – Non Magnetic – Autorotor,” highlighting Cyma’s proprietary shock protection system and technical features. Specifications Brand: Cyma Model: Navystar Period: circa 1943–1954 Movement: Automatic bumper, Cal. 420 (in-house) Jewels: 17 Case: Gold-plated Case back: Stainless steel Diameter: approx. 32 mm (excluding crown) Crystal: Plexiglass Strap: Leather (aftermarket) Condition The watch is in working condition Service history is unknown; a service is recommended Original dial with visible patina Signs of wear consistent with age Movement appears original and correct for the model Remarks A genuine early Swiss automatic watch with historical significance, featuring a classic bumper movement and timeless design. A collectible piece from the golden era of mechanical watchmaking. Please refer to the photos as part of the description of the watch. Fast delivery 2-3 working days with DHL Express!!