Longines watch is marked by flying wing hourglass. Longines logo is a combination of flying wing hourglass and English letters * * *. Flying wing hourglass is the symbol of the brand, Longines is the name of the brand.
Longines is a watch brand under the Swiss Swatch Group. As early as 1889, when Longines' brand founder decided to use this combination as Longines' logo, he applied for patent registration, thus protecting Longines' good reputation from infringement.