Lange 31/en

Lange 31

Lange 31 (Platin), Ref. 130.025

Lange 31 (Rotgold), Ref. 130.032

Kaliber L034.1

Movement: Lange manufacture calibre L034.1, manually wound, crafted to the highest Lange quality standards and assembled and decorated by hand; precision-adjusted in five positions; twin mainspring barrels; plates and bridges made of untreated German silver; balance cock engraved by hand Movement parts 406 Jewels 61, including 1 transparent sapphire jewel Screwed gold chatons 3 Chatons Escapement Lever escapement Balance Shock-resistant glucydur screw balance, Nivarox hairspring balance with a frequency of 21,600 semi-oscillations per hour, whiplash precision index adjuster with patented constant-force escapement Power reserve 31 days (744 hours) when fully wound, with stopwork Functions Time display in hours, minutes, small seconds, with stop seconds, outsize date, power-reserve indicator Operating elements Winding key with integrated backstop ratchet and torque limiter, crown for setting the time, push piece for advancing the date display Case dimensions Diameter: 45.9 millimetres; height: 15.9 millimetres Glass and caseback Sapphire crystal (hardness 9) Movement dimensions Diameter: 37.3 millimetres; height: 9.6 millimetres Dial: Solid silver, argenté or Solid silver, rhodié Strap: Hand-stitched red brown crocodile strap or Hand-stitched black crocodile strap