Inspired by the first Longines chronograph wristwatch presented in 1913, the Longines Column-Wheel Single Push-Piece Chronograph houses an automatic movement developed by ETA exclusively for Longines and equipped with a column-wheel chronograph mechanism offering 54 hours of power reserve.
Two versions, one in steel (ref. L2.7184.108.40.206) and one in rose gold (ref. L2.7220.127.116.11), feature Arabic numerals while the third version (ref. L2.718.104.22.168), available in steel only with moving lugs, comes with Roman numerals. This version has a slightly thicker case with a more angular profile.
On all three versions, the movement’s blue column wheel can be admired through the transparent sapphire crystal case back.