One of the coolest tourbillons we saw at SIHH in January was A. Lange & Sohne’s Richard Lange Tourbillon “Pour le Merite.”  This is the watch, designed after a 19th century pocketwatch (pictured below), that has a dial that is only fully visible during half of the day.  The point of the disappearing dial? Simple, really. The folks at ALS just want the wearer of this Pour le Merite to be able to view the fantastic tourbillon that he or she is paying for.

The Richard Lange Tourbillon is a regulator, with the minutes being displayed on the top dial while hours on bottom right, seconds via the tourbillon at bottom left. During the hours of 12-6, half of the hour dial is missing to display the full tourbillon.  Once the watch hits 6, the dial pops back into place and a full circle is displayed again.  As this is a “poure le merite” watch, it is driven by a fusée and chain transmission to ensure regular power delivery while the watch is being wound and as it works through its power reserve.

Only 100 of these watches will be made in platinum and cost will be $211,900.  The size of this tourbillon from A. Lange & Sohne is 41.9mm and it is also available in rose gold.  For more details on A. Lange & Sohne’s Richard Lange Tourbillon “Pour le Merite,” click here.