Breguet Classique Grande Complication 3657BA/12/9V6
wristwatch in yellow gold, with tourbillon. Hand-wound movement, engraved by hand. Power-reserve and 24-hour indications. Small seconds on the tourbillon shaft. Compensating balance-spring with Breguet overcoil. Silvered gold dial, hand-engraved on a rose-engine. Sapphire caseback. Water-resistant.