The Vacheron Constantin Classique Rectangular Tank 18k Yellow Gold (Reference 70002) is a rare highly collectible, ultra-thin vintage dress watch featuring a Sigma dial and a manual-wind Caliber 1009 movement.

• Case Design: An elegant, rectangular "Tank" shape crafted entirely from 18k solid yellow gold, drawing design inspiration from classic mid-century geometric styling.

• The Sigma Dial: The dial features the rare "Sigma" symbols (σ SWISS σ) at the bottom. This designation was used by select high-end Swiss watchmakers in the 1970s to certify that the hands and hour indices were made of solid gold. 

• Movement (Caliber 1009): A premium, ultra-thin, manual-winding mechanical movement built by Vacheron Constantin, designed explicitly to preserve the watch's slim, sleek profile.