Vintage Cortebert Chronograph Diver Watch

This is a vintage Cortebert chronograph diver's watch featuring a robust stainless steel tonneau-shaped case with a multi-link oyster-style bracelet. The watch features a black sunburst or matte dial characterized by three sub-dials (comprising a 60-second counter, a 30-minute or 60-minute counter, and a 24-hour indicator) and a date window positioned between 4 and 5 o'clock. The dial markings include the Cortebert crown logo and 'Cortebert 660ft/200m' text. The hour markers are applied gold-tone indices with aged tritium or lume plots that show a warm orange patina, matching the broad sword-style handset. The black rotating 'ghost' bezel displays a 60-minute scale, showing some fading and minor scratches consistent with use. The case features a large knurled screw-down crown flanked by two round pump-style chronograph pushers. Notable condition issues include surface scratches on the acrylic crystal, scuffing on the bracelet and case, and significant patina on the luminescent material. Based on the styling, sub-dial layout, and depth rating, this piece likely dates to the late 1960s or early 1970s and potentially houses a Valjoux or similar manual-wind/early-automatic movement. The overall construction suggests high-quality Swiss craftsmanship intended for professional aquatic use.