A. Lange & Söhne Lange 31

The A. Lange & Söhne Lange 31, reference 130.039F, has an 18-carat white gold case in a limited edition of 100 pieces. The grey dial is made of solid silver and carries an outsize date and power-reserve indicator. Case diameter is 45.9 mm and height is 15.9 mm, with 22 mm between the lugs. The case has a see-through back and water resistance rated to 30 metres. A dark brown alligator leather strap closes with a white-gold folding clasp. Manual-winding calibre L034.1 comprises 406 parts, incorporates a constant-force escapement and has a 744-hour power reserve at 21,600 semi-oscillations per hour.