As the backbone of Jaeger-LeCoultre, the Master series emphasizes not only deep technological value, but also its performance and design in terms of practicality. And even if it is equipped with a precise tourbillon device, the Master series still does not change its precise and practical nature. In addition to being able to wear it with peace of mind, it also adds a number of practical orientation functions suitable for business people.
Master Grande Tradition a Tourbillon 43
Cal.978 automatic refining movement. Platinum material. Diameter 43mm. Hour, minute, second indication. Date, time indication. Tourbillon. Sapphire crystal. Bottom cover. Water-resistant to 50 meters. Limited to 200.
Cal.978 adopts Jaeger-LeCoultre’s new-generation tourbillon mechanism. The R & D team designed a new balance wheel with an inertia of ‘11.5 mg × cm2’. This new balance wheel has four weight screws that can adjust the inertia It can stably allow the balance wheel to run at a high speed. The energy loss caused by the friction of parts can also be solved by Jaeger-LeCoultre’s special low-friction coefficient ‘spyr’ shaped gear. Housed in a tourbillon frame with limited space.
As for the Cal.978 automatic winding movement commonly used in the tourbillon watches of the ‘Master Grande Tradition a Tourbillon’ and ‘Master Contral Tourbillon’ series, in addition to the basic hour, minute and second indication functions It also has date indication and 24-hour second time function. The date indication part also has a special ‘jumping’ design. When the date reaches the 15th day, in order not to hinder the wearer from enjoying the tourbillon mechanism at the 6 o’clock position, the pointer will then jump directly over the tourbillon. On the 16th, in addition to the designer’s inspiration, such ingenuity must also have a certain technical foundation to achieve.
In the most important part of the tourbillon, Cal.978 adopts Jaeger-LeCoultre’s new generation tourbillon mechanism, whose vibration frequency is ‘28,800 times / hour’ which is rare on the tourbillon. In terms of watch common sense, the size and vibration frequency of the balance wheel are directly proportional to the mainspring energy consumed. For a tourbillon mechanism with a high vibration frequency like Cal.978 movement, the general practice is to reduce the size of the balance wheel and increase the frequency. Boxes, but they will have a huge impact on the aesthetics and daily practicality of appreciation! Jaeger-LeCoultre’s R & D team refused to compromise, so they set out to design a new balance wheel in order to maintain its size enough, coupled with Jaeger-LeCoultre’s special low-friction “spyr” shaped gear, allowing the entire tourbillon mechanism to play its role. Maximum operating efficiency.
This new tourbillon mechanism is not only used on Cal.978 movement, but also on Cal.987 derivative movement with perpetual calendar function. In addition, these two movements are no exception. Before leaving the factory, they must pass the Master Series exclusive and rigorous ‘1000-hour astronomical table test’ quality certification.
Master Grande Tradition Tourbillon aQuantieme Perpetuel
Cal.987 automatic winding movement 炼 18K rose gold material ∕ Table diameter 42mm ∕ Hour, minute and second indications ∕ Perpetual calendar function ∕ Tourbillon ∕ Sapphire crystal surface and bottom cover ∕ Water-resistant to 50 meters ∕ Limited to 300 pieces
Master Date Tourbillon
Cal.978 automatic winding movement ∕ 18K rose gold material Ø 39mm diameter, hour, minute, second indication ∕ date indication ∕ tourbillon ∕ sapphire crystal mirror surface, bottom cover ∕ waterproof 50 meters
Cal .978 automatic winding movement ∕ 18 K rose gold material ∕ table diameter 41.5mm ∕ hour, minute, second indication ∕ date, two places time indication ∕ tourbillon ∕ sapphire crystal mirror surface, bottom cover ∕ water-resistant to 50 meters — –