Double rattrapante Beyond the simple "stop watch" function, a rattrapante chronograph also allows lap-time measurements, time comparisons, and the determination of the fastest or slowest of several laps. With conventional rattrapante chronographs, these measurements are confined to the seconds scale and thus limited to a duration of 60 seconds. The double rattrapante mechanism developed by Lange has an additional rattrapante hand for the minute counter. This makes it possible for the first time to meaningfully exploit the rattrapante functions - for events that last up to 30 minutes.

Balance cock Small metal plate screwed to the visible side of the movement. It carries the balance wheel shaft bearing.

Diamond endstone A balance wheel shaft held in place by means of a diamond counter-bearing, or endstone, was one of the hallmarks of "1A" quality pocket watches made by Lange. In Lange tourbillon watches of the new era, diamond endstones limit the axial "play" of the carriage on both sides.

Gold chaton The gold setting of a bearing jewel - in Lange watches, chatons are often secured to the three-quarter plate with two or three screws.

All in all, Lange manufactured only 35 pocket watches with separate double-chronograph or | rattrapante functions, among them this precious double chronograph that dates back to 1891. - Gilt FU quality (designation for 1A quality until 1893) movement: Screwed | gold chatons, engraved | balance cock with | diamond endstone and whiplash precision index adjuster, compensation balance with gold screws, lever and escape wheel in gold. The double-chronograph mechanism with the column wheel and the split-seconds clamp is visibly configured above the movement. - Enamel dial with small seconds, outer scale with 1/5 second intervals for the two chrono sweep-seconds hands, signed "F. Krüssmann Y CIA , NO 29571" (name of customer). - The 18-carat pink-gold case was crafted later (original yellow-gold case missing).