For sale: stunning LONGINES ULTRA-CHRON professional diver's watch, with rotating bidirectional Bakelite outer bezel. Large squared steel case. Dial in splendid condition, original crown. Timepiece completely original and in very good condition overall. Solid steel casing in three sections, revolving bidirectional outer bezel with decompression times scale, featuring a Bakelite insert with luminescent triangular cursor at 12 o'clock and red minute markers. Screw-in case back. External features: logo and inscriptions, 'LONGINES ULTRA-CHRON', case number and 'Modèle Déposé'. Internal features: regular Longines hallmarks and reference No. 7970-5. Casing size: 41 mm (excluding crown) x 44 mm (lug–to–lug). Dial: matte black, with spacious design and minute marks printed in white. Applied hour marks (tritium treated steel). Blunt hour and minute hands (tritium treated steel). The minute hand is painted orange, slightly faded at the tip. Applied Longines steel logo at 12 o'clock, with 'Longines Automatic' inscription. Applied Ultra-Chron steel logo at 6 o'clock, with 'Ultra-Chron' and 'T-Swiss Made-T' inscriptions. Date display at 3 o'clock. Movement: automatic, Longines calibre 431, 36,000 vph at 25. In perfect working order. Longines branded bracelet, length 18 cm. Crystal: plastic. Insured shipping with tracking.