The 1815 RATTRAPANTE PERPETUAL CALENDAR unites two refined classic complications in a wristwatch: a rattrapante-chronograph and a perpetual calendar with a moon-phase display. When they designed these functions, Lange’s masters prioritised the use of traditional solutions that challenge the watchmaker’s abilities to the extremes.

In this movement with a total of 631 individual parts, the process of adjusting all switching sequences and thus of assuring optimised rate accuracy is a particularly challenging task. The perpetual calendar mechanism alone consists of 211 parts, and another 206 components constitute the rattrapante-chronograph mechanism. In the L101.1 manufacture calibre, high rate accuracy is guaranteed by a screw balance which is powered by a balance spring developed and crafted in-house.
 

Technical Details

Winding mechanism – Manually wound movement

Power reserve – 42 hours

Water resistance – 3 bar

Complications – Calendar function, moon-phase display, chronograph

Case material – 18-carat pink gold, Case back: sapphire glass

Case dimension – Case diameter: 41.9 mm, Case thickness: 14.7 mm

Dial colour – Argenté

Metal weight – 156 gr

Strap – Reddish-brown, Alligator leather

Buckle – 18-carat pink gold

Distance between horns – 20 mm

Movement designation – L101.1

Number of movement parts – 631