Rectangular 8-day movement, gold-plated, Swiss lever escapement, bimetallic balance, Breguet balance spring. Hand-setting and winding mechanism underneath the base
This model is one of the very first single-axle "Mystery" clocks produced by Cartier. In exceptional condition, this clock is a stellar testament to the exquisite craftmanship and unmatched prestige of Cartier "Mystery" clocks.
Cf. The Cartier Collection - Timepieces, Editions Flammarion, p. 197