This watch is fitted with moon phase indicator, big date display, 12 days energy reserve and constant escapement speed.

No matter its appearance or case back. Richard Lange Perpetual Calendar Terraluna is also stunning. Its 45.5 mm case is made of 18 k rose gold or white 18k gold, presenting the sophisticated instrument in the dial. But the movement is a window through which you can see the latest achievement. Depicting moon, earth, and sun orbit. Three counters are set upon the Richard Lange Pereptual Calendar Terraluna, while hour and second counter is set at right and left side. Just like Richard Lange Tourbillon Pourle Merite, the dial comes from a historical masterpiece.

Four perpetual window

In the unique Lange big date display, there is week display and month aperture and they are in a line. Perpetual calendar, after programmed, could correctly display the date of years, including leap year, so no adjustment need to made to it before 2100. Leap year display is set at a small aperture. All the date display could jump forward, to make sure that the displaying is clear. Energy will be saved through the moving of protruding gears, to minimize the strength, so that it can be released in middle night.

Two Weeks Energy

Being one of the best replica watches, it is fitted with two main spring barrels, and has 14 days of energy reserve. As the barrels could store strong energy. In order to make sure that the whole energy could maintain in a constant speed, special techniques must be applied to control it. Usually, fully winding barrel could released extra torque, but when the barrels is close to unwinding state, the torque will decline, then the precision will be affected. A perpetual escapement could offset there two disadvantages. This system could released the balance wheel in every 10 seconds so that the torque could be maintained.