A. Lange & Söhne Zeitwerk Handwerkskunst

The A. Lange & Söhne Zeitwerk Handwerkskunst, reference 140.048, displays jumping numerals within a 41.9 mm case made of 950 platinum. Introduced in 2012, this is a limited edition of 30 pieces. The black dial is hand-decorated with tremblage engraving and carries a power-reserve indicator. The time bridge is rhodiumed German silver, and the hands are rhodiumed gold. Case height is 12.6 mm, with a see-through back and a 30 metre water-resistance rating. A black alligator leather strap uses a 950 platinum pin buckle. Manual-winding calibre L043.4 beats at 18,000 semi-oscillations per hour and runs for 36 hours. The 425-part movement has a constant-force escapement.