Breitling Premier B21 Chronograph Tourbillon 42 Gaston Breitling

Breitling's Premier B21 Chronograph Tourbillon 42 Gaston Breitling, reference JB2120A61B1P1, is a chronograph cased in 18k white gold at 42 mm across and 15.25 mm thick. The self-winding B21 calibre, built with La Joux-Perret, drives the watch and provides 55 hours of power reserve. A cambered sapphire crystal, glareproofed on both sides, covers the grey dial, and a sapphire display back shows the movement's oscillating weight and tourbillon in contrasting gold. The tourbillon sits at 12 o'clock, paired with a chronograph function and small seconds, and this piece belongs to a limited edition run. An alligator leather strap closes with a folding clasp in white gold. The case holds its rating of 100 metres thanks to a two-gasket crown.