A. Lange & Sohne Richard Lange Jumping Seconds 39.9mm White Gold Manual Winding

The A. Lange & Söhne Richard Lange Jumping Seconds Ref. 252.029 represents scientific horology executed with manufacture precision. This 39.9mm white gold regulator-style timepiece features three overlapping subdials with jumping seconds complication. Black solid silver dial with white Roman numerals and red minute markers creates high contrast legibility. Manufacture Caliber L094.1 manual-winding movement delivers 42 hours autonomy with constant-force escapement ensuring uniform amplitude. Limited to 100 pieces when introduced at SIHH 2019.

Richard Lange collection honors Ferdinand Adolph Lange who patented jumping seconds mechanism in 1877 for precision observation instruments. Modern interpretation separates hours, minutes, and seconds into distinct circles mimicking regulator clocks. Caliber L094.1 contains 390 components with 50 jewels beating at 21,600 vph. Constant-force mechanism uses remontoir spring delivering consistent power regardless of mainspring tension. Jumping seconds hand advances exactly on marker creating ticking motion unusual for mechanical watches. Zero-reset function with hacking seconds enables precise time synchronization.

Black dial variant introduced in 2019 represents rare aesthetic choice for A. Lange & Söhne. Polished 18k white gold hands and applied markers maintain legibility against dark background. Red power reserve indicator warns when winding needed. Regulator display divides time measurement into separate functions enhancing precision reading. Hand-engraved balance cock and Glashütte ribbing visible through sapphire caseback. This preowned example represents accessible entry into advanced complications from German manufacture with limited production adding collectability. The 39.9mm sizing and manual winding appeal to traditional watchmaking purists.