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.

"A. Lange & Söhne" began building ratchet-wheel pocket chronographs very early on, starting in 1868. This priceless timepiece dates back to 1903. - Gilt 1A quality 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 chronograph mechanism with the ratchet (also called column) wheel is visibly configured above the movement - Enamel dial with 30-minute counter and small seconds, outer scale with 1/5 second intervals for the centre-sweep chronometer hand. Signature: A. Lange & Söhne, Glashütte b. Dresden - 18-carat pink gold case