Zenith El Primero chronograph, Rainbow model, reference: 30-0360.400, sought-after specimen from the early '90s, in good condition as shown in photos, full-set kit. Case and case back in 18 kt - 750/1000 gold, total weight 87,28 Gr, 40 mm diameter (excluding crown), 11.5 mm thick, screw-down crown. Screw-down case back with engraved Rainbow logo and reference, sapphire crystal in excellent condition. Beautiful enamelled dial with three sub-dials, calendar/date between 4 and 5 o'clock, raised gold markers, gold phosphorescent hands which allow a comfortable and trouble-free reading of the displays. House-made movement, 31 jewels, this model is equipped with the famous calibre 400, used by Rolex in Daytona chronographs, high frequency vibrations of 36,000 A/h, works perfectly, the chrono section starts and resets correctly. Water resistance: 5 ATM. Original used strap with original buckle bearing the logo (see photos), also with (already mounted) a generic strap