Cal. L901.0 three quarter plate twin barrel nickel-finished lever 53 jewels screwed gold chatons finely engraved balance bridge swan neck regulator the solid silver dial with black hard enamel lozenge-shaped and Roman numerals large double window for date eccentric aperture for up and down indicator and subsidiary seconds dial the circular case with solid gold crown downturned lugs the glazed back secured by six screws 18K gold A. Lange & Söhne buckle case dial and movement signed