The Patek Philippe Ellipse 3930 in Stainless Steel is a highly coveted collector's piece, primarily because the Golden Ellipse collection was traditionally crafted almost exclusively in precious metals like yellow and white gold. Produced circa 1985, this reference is one of the few examples featuring a steel case, making it significantly rarer than its gold counterparts.

• Case: Stainless steel oval case measuring approximately 29mm x 34mm (or 33.5mm) with a slim profile of roughly 6mm. It features the collection's signature "T-bar" integrated lugs.

• Movement: Powered by the Patek Philippe Caliber E23C (also referred to as E23 SC), a high-grade 7-jewel quartz movement with a date function.

• Dial: Typically features a sunburst blue "Sigma Dial" with applied white gold baton hour markers and a date aperture at 3 o'clock.

• The "Sigma" Mark: The presence of the lowercase Greek letter sigma (σ) at the bottom of the dial indicates that the hour markers and hands are made of solid gold. This marking was used by the APRIOR group in the 1970s and 80s to highlight the intrinsic value of materials during the quartz crisis.