Belonging to the Christophe Claret collection of Traditional Complications, Allegro is available in either red gold or white gold with titanium and is inspired by Christophe Claret's previous creations while pushing the limits of what’s possible in watchmaking. The movement has been completely redesigned, from the plates and bridges through to the inertia flywheel regulating the minute repeating mechanism, and including the regulating organ. The balance, balance spring and anchor have all been developed and manufactured in-house.
Allegro's caliber is regulated by a 3 Hz (21,600 vibrations per hour) balance, and powered by a single mainspring barrel - rare for this type of movement - providing a very healthy 60-hours of power reserve. The minute repeater is activated by a traditional slide at 10 o'clock on the left side of the caseband. Part of the repeater mechanism, the rake, is visible through an opening in the lower section of the sapphire dial. Both hammers – the four-armed balance wheel and repeater inertia governor - are visible through the display back. For Allegro, Christophe Claret selected a balance wheel with countersunk screws. Despite being more complex, this type of balance offers a near perfect inertia/weight ratio, aerodynamic form, and ease of regulation and balancing.
Cathedral gongs, which circle the movement not once but twice, are a particular passion of Christophe Claret's and considerable emphasis is devoted to their manufacture using traditional drawn steel, as well as assembling and tuning. The cathedral gongs also benefit from a patented Christophe Claret invention that minimizes excessive vibrations resulting in clearer crystalline chimes. Allegro's movement has no fewer than three patents for: the big date, the balance micro-regulation, and the gongs. The numbers of the patent are engraved on the back of the caseback.
Allegro's complications offer several useful features. A GMT/second time zone is displayed at 3 o'clock on the dial and is adjustable by means of a caseband pusher at 4 o'clock. Complementing the GMT is a day/night indicator. The big date is placed at 12 o'clock and adjusted by a caseband pusher at 2 o'clock; the small seconds are displayed in a subdial at 9 o'clock.
Allegro's stunning movement - beadblasted and rhodium-plated nickel silver for the white gold version or pink gold for the pink gold version - is emphasized by the 45mm case: a harmonious blend of red gold or white gold, depending on the version, and anthracite PVD treated grade 5 titanium, draws in the eye with light that glimmers off of a polished satin finish.
The hands are crafted from either orange sapphire crystal and anthracite PVD treated titanium, or sapphire crystal, black lacquer and anthracite PVD titanium.
Through the display back we see the famous stepped and skeletonized Charles X type bridges. The Charles X style of bridge, so dear to the heart of watchmakers, is also found on the balance cock, which features a patented regulation system and shock protection set in a ruby bearing housed in a gold chaton.