From Leonidas, one of the historic names in Swiss chronograph manufacture—famously merging with Heuer in 1964 to create the legendary "Heuer-Leonidas" brand—this is a rare and collectible Dual-Register Chronograph dating back to the 1940s. Capturing the military and pilot watch design language of the World War II era, it features a 35 mm (excluding crown) case, a factory-original ivory/cream dial, radium-style Arabic numeral indices, heat-treated blued steel hands, dual-register layout, and is powered by the cam-lever Landeron Caliber 48 hand-wound movement, offering authentic mid-century character on the wrist. ​Case Dimensions & Construction ​Case Dimensions: Approximately 35 mm across excluding the winding crown (approx. 37.5–38 mm including crown / 42.5–43 mm vertical lug-to-lug length / 18 mm lug width). Classic 1940s chronograph proportions with curved lugs and a domed acrylic crystal provide a comfortable and balanced wrist presence. ​Case, Pushers & Crown: Chrome-plated case body paired with a solid stainless steel screw-down caseback ("CHROMIUM STEEL BACK"). Features a knurled winding crown at 3 o'clock alongside period-correct mushroom/pump-style chronograph pushers at 2 and 4 o'clock. Given around 80 years of age and past use, vintage hairline scratches, slight plating wear, surface patina, and minor contact marks are present on the case flanks, bezel, and lugs. ​Crystal: Domed acrylic (plexi) crystal. Superficial hairline marks and light age-related scratches are visible on the crystal face. ​Caseback: Original solid stainless steel screw-down caseback. The exterior retains a satin-brushed finish and the clear engraving "CHROMIUM STEEL BACK". The interior features circular perlage finishing, the "SWISS" hallmark, and serial number 738343. ​Dial & Subdial Details ​Dial Condition: 100% factory-original (unrestored / non-redial) ivory / light cream military chronograph dial. Displaying the clean "LEONIDAS" signature and an outer track with fine chronometric seconds and telemeter/tachymeter scales. ​Indices & Handset: Open-style Arabic numerals showing warm, natural vintage patina. Complemented by heat-treated blued steel sword hands and matching blued subdial indicators. ​Registers: ​Running Small Seconds Subdial at 9 o'clock, ​30-Minute Chronograph Counter at 3 o'clock, ​Central slender chronograph sweep seconds hand. ​Movement & Strap Details ​Movement: Authentic Swiss-made, 17-jewel, cam-lever operated Landeron Caliber 48 manual-wind chronograph movement. Retains the original regulator stamp ("A / R - F / S"), balance assembly, and clean chronograph bridges. Operating via the signature Landeron sequence: the top pusher starts the chronograph, while the lower pusher stops and resets it. ​Operational Status: The Landeron 48 caliber . ​Strap & Buckle Disclosure: Fitted with a brand-new textured olive/khaki-green leather strap and a steel pin buckle that pairs naturally with the ivory dial. Please note that the strap and buckle are non-original (aftermarket). ​Please Note: Vintage Leonidas chronographs made prior to the 1964 Heuer merger hold a respected place in vintage horology, particularly for their military and aviation lineage. Age-related hairline scratches and chrome plating wear on the case, surface marks on the plexi crystal, and the aftermarket strap . Due to its 1940s vintage nature, no water resistance warranty is provided. For cross-border or international shipments, any potential customs duties, taxes, or additional clearance fees remain entirely the responsibility of the buyer. Please inspect all macro photographs thoroughly prior to purchasing.