A. Lange and Söhne Datograph 403.025

A revolutionary idea in the manufacturing & operation of mechanical chronographs. This watch features: Black colored solid silver dial with Applied Roman Numeral & Index Hour Markers. Patented large double window date display located at the top of the dial with quick correction button located on the case edge at the 10 o'clock position. Chronograph movement with flyback function - allowing the stop-watch to be instantaneously restarted for continuous timing, without having to stop, reset and then restart the chronograph. Furthermore the minute hand of the chronograph jumps in 1 minute increments rather than continuously moving - this allows for accurate reading of the timing function. The movement has 40 jewels & beats at 18,000 vph. The movement has an approximate power reserve of 36 hours.

For sale is iconic Lange Datograph in platinum, original 39mm version.

Condition: Like new, unworn since recent full Lange service.

Includes presentation box, leather wallet, manual, and service receipt, but no original certificate. Tang buckle.

$42.5K or best offer. Please contact tahoeb at gmail dot com for further info. Many references.