FRANCOIS BORGELA RARE MILITARY 18K YELLOW GOLD TRENCH WRISTWATCH.Date: Circa 1900'sMovement: Manual SwissDial: White, black Roman numerals, black outer minute division, subsidiary dial at the 6 o'clock position, blued handsCase: Signed, polished 18K yellow gold, "trench watch case" No.719161Size: 32.2mmWeight: Approx. 35gDuring the First World War the soldiers had the need for the first time of a waterproof watch and one of the pioneer in the design and manufacturing of those watch cases was "Francois Borgel". The design became popular between officers in the trenches during the Great War. Different brands adopted the design like Longines and IWC for example in the beginning.