Jaeger-LeCoultre Master Control Chronograph Calendar
To celebrate 30 years of excellence in horology for their Master Control collection, Jaeger-LeCoutre has updated the traditionally steel bracelet watch series by adding a quick-change system and providing an extra Novonappa calfskin leather. These highly technical timepieces have always had serious presence, while the inclusion of a leather strap now provides a more casual and relaxed look.The round 40mm case is made out of stainless-steel with a mixture of polished surfaces and brushed casebands. While mounted to the case is a thin steel bezel with a mirror-like polished finish.
On the flip-side is a sapphire exhibition case back that allows a view into the inner workings of the mechanical movement. It features a gold oscillating weight, designed in the form of the “JL” logo.
It comes equipped with two rectangular-shaped pushers to operate the chronograph functions, followed by very small push pieces that can be used to set the calendar elements. While in the middle of those complication regulators is the standard setting-crown, decorated with a “JL” embossed logo.
All topped by a sapphire crystal with an anti-glare treatment. Water-resistance on this watch can reach up to 50 meters (164 feet).
Time is exhibited on a silvered gray dial with an elegant sunray-brushed finish. It is adorned by steel applied hour indexes, followed by a ring of black printed minutes/seconds markings. Plus circling around the flange is a pulsometer.
On the upper-half of the dial, directly underneath the Jaeger-LeCoultre logo we encounter a double-window for the weekday and current month.
There are three sub-dials: a 30-minute counter at 3 o’clock, a sub-seconds at 9 o’clock, and a calendar with a blue sky star-lit decorated moonphase in its midst. Each sub-dial has also been given a red numeral for an added touch of color and a quicker glance read. 
The Dauphine-shaped central hands and dots aligned with the steel-applied hour index markers have all received a luminescent filling, for an enhanced legibility.
Jaeger-LeCoultre Master Control Chronograph Calendar
The “Jaeger-LeCoultre Master Control Chronograph Calendar” (Ref#: Q413812J) is powered by the self-winding mechanical movement, caliber 358 with 37 jewels, 358 components and 28,800 Vph. Power reserve on this watch can last up to 65 hours, when fully wound.
Mounted on the watch is a new interchangeable steel bracelet, secured by a folding clasp or a light-brown strap in Novonappa calf leather, secured by a deployment buckle. 
While both are equipped with the quick-change system to allow for swift swaps between them. For more up to date information visit the official Jaeger-LeCoultre website here.
