CASE: Three-body, egg-shaped, polished, the bezel set with 117 round diamonds (approx. 0.99 ct) on the inner and outer edge, coin-edge band, case back with transparent aperture and 6 screws, cabochon sapphire-set winding crown at 4, sapphire crystals. DIAL: Mother of pearl with painted radial Breguet numerals on an offset engine-turned silver reserve, subsidiary guilloche seconds dial, sector for the power reserve and aperture for moon phases at 12, secret Breguet signature. Blued steel Breguet hands. MOVEMENT: Cal. 537 DRL, rhodium-plated, fausses cotes decoration, 23 jewels, straight-line lever escapement, monometallic balance adjusted to 5 positions, shock absorber, self-compensating flat balance spring. Dial, case and movement signed, in good condition DIM: 37 x 29 mm. THICKNESS: 10 mm.