Jaeger-LeCoultre Master Grande Tradition à Quantième Perpétuel 8 Jours SQ Watch Review

Jaeger-LeCoultre has revealed the Master Grande Tradition à Quantième Perpétuel 8 Jours SQ, a limited edition timepiece inspired by a historical pocket watch from 1928.

The timepiece is limited to 200 pieces, and presented a new technical and artistic challenge to Jaeger-LeCoultre's engraving and skeletonising artists.

“It is indeed a high art to pare away as much ‘flesh’ as possible from a movement without adversely affecting its qualities”, said master engraver Dominique Vuez. "Our customers want to be able to see as many of the details as possible. But when we skeletonise a movement, we must assure that neither its rigidity nor its reliability could potentially be undermined."

Vuez studied the documents for the Jaeger-LeCoultre Calibre 876 movement to determine which components could be pierced and which parts could be cut away. Using his detailed skeletonising plan, the movement was meticulously sawn away using traditional jigsaws, before the parts were individually bevelled, polished and elaborately engraved by hand.

Two white gold rings, one for the dial and another for the case back, were finely chiseled by hand and covered with a blue transparent enamel using the grand feu 'champlevé' method. Master enameller Miklos Merczel and his team applied the enamel using a very small paintbrush, before firing the pieces in a kiln at between 800 and 820 degrees Celsius to achieve the blue hue. The pieces were then delicately polished with diamond powder.

As it would be impossible for the engravers and enamellers to create two absolutely identical models, each of the 200 timepieces are unique.

The Jaeger-LeCoultre Master Grande Tradition à Quantième Perpétuel 8 Jours SQ has an 18kt white gold case measuring 42 mm, and two sapphire crystals. It has a perpetual calendar function with day, month, date, year and moon phases, a day/night indicator, and a power reserve display. The watch comes with a black alligator strap.