Patek Philippe. A fine 18K gold wrist chronograph with perpetual calendar and moon phase
Ref. 3970E, Second Series, case no. 2851187, movement no. 875320, circa 1990
Cal. CH27-70Q movement adjusted to temperature, isochronism and position, seal of Geneva, 24 jewels, free sprung Gyromax balance, opaline white dial with applied gold baton numerals, subsidiary dials for 30-minute register incorporating leap year indication, continuous seconds enclosing 24-hour dial, date ring with aperture for moon phase, rectangular day and date apertures, within a polished and brushed case with concave bezel, fluted lugs, screw-down case back, case, dial, and movement signed, leather strap with signed 18K gold buckle. 37 mm diam.