140 A

The Sinn 140 A draws serious attention thanks to its heritage as the evolution of the chronograph worn by German astronaut Reinhard Furrer during the 1985 Spacelab D1 mission. This model continues Sinn’s tradition of technical innovation, featuring the brand’s signature tool-watch aesthetic and a distinctive tonneau-shaped 44mm case that wears comfortably despite its presence on the wrist. Collectors value the 140 A not just for its space connection but for its role in Sinn’s lineup as a showcase of German engineering and functional design.

Reference 140.020 is the most common variant, housing the automatic Valjoux 7750 movement, while earlier models used the Lemania 5100. The switch to the 7750 impacts both collectability and serviceability—Lemania-powered pieces command higher prices due to rarity and historical cachet, but the 7750 models like the 140 A offer easier long-term maintenance. Look for the black PVD-coated case and integrated bracelet, which set this version apart from earlier brushed steel 140s; these details matter for value and authenticity.

Pricing varies based on movement, condition, and originality of the PVD finish. Water resistance is rated at 100 meters, making the 140 A a practical daily wearer as well as a collector’s piece. When buying, scrutinize the PVD coating for excessive wear, and confirm the presence of original Sinn-signed crowns and pushers—these details are often replaced during servicing and can affect both value and desirability.