Why This Watch Matters Vintage aviator charm in a period appropriate case size. The Full Story Heuer has a rich history of tool-watch production. Whether it was stopwatches or chronographs, the Swiss brand knows a thing or two about timing events, particularly of the sporting variety. This 1930s monopusher (sometimes called a single-button chronograph) with black dial is an interesting and rare watch. It features a glossy black dial as well as engine-turned sub-dials that line up nicely with the central axis of the hands, giving it a very balanced aesthetic. The pusher at two o'clock starts and resets the chronograph, while time is set traditionally via the crown at three o'clock. This rationale behind this is that the operator can restart faster, one can check the elapsed time and quickly reset. The current watch has a period-appropriate diameter of 32mm. While this may seem on the small side by today's standards, it has a surprising thickness of 11mm to give it a solid wrist presence. Further, we've paired it with a HODINKEE Dark Brown Kangaroo NATO Strap that gives off an authentic aviator look. The Fine Print Maker: Heuer Model: Single button chronographReference: 2403Year: 1930sCase No: 31711; Movement 40093Material: Stainless steel Dimensions: 32mm diameter; 11mm thickness Crystal: Plexiglass Lume: Yes, radium Caliber: Manual-winding Landeron 13 Bracelet/Strap: HODINKEE Dark Brown Kangaroo NATO Lug Width: 17mmBox/Papers: No What we Love and What You Should Know This Heuer is in very nice condition for its age. The case is strong with scratches. The caseback has light scratches, as does the side of the case at nine o’clock. The lume on the hands and dial has darkened. The minute hand may have been partially relumed. The black dial retains its gloss and has developed patina throughout. The dial has some marks. The crown is unsigned, which is common for this time period. The dial and movement are signed "Heuer," and the case is signed, "Staybrite," with a Heuer serial number underneath. The crystal has some scratches.