A gilt brass 'Atmos' timepiece Jaeger-LeCoultre, model 526-6, circa 1970 The single train movement wound via the expansion and contraction of an aneroid chamber mounted to the rear of the mechanism and regulated by torsion escapement with rotating balance suspended at the base of the movement and numbered 138261 to suspension platform, the circular gilt on white baton numeral chapter ring with Arabic quarters enclosing motionwork inscribed ATMOS, JAEGER LECOULTRE, FAB. SUISSE, SWISS MADE, the rectangular five-glass case with canted angles and pin-hinged front door over plinth base incorporating bubble level to the engine-turned interior, with adjustable feet to underside, 23.5cm (9.25ins) high.