Longines Ultra-Chron Ref. 7826-1 brown yg

Longines introduced the Ultra-Chron in 1967, at a time when mechanical precision remained one of the defining challenges of Swiss watchmaking. Rather than relying on conventional frequencies, Longines developed a family of high-beat automatic movements operating at 36,000 vibrations per hour, an impressive technical achievement for a production wristwatch of the period. The Ultra-Chron name became synonymous with this pursuit of precision, reflecting the manufacturer's ambition to bring high-frequency chronometry to the wristwatch market.

At the heart of this generation was the in-house calibre 431, an automatic movement with central seconds and date, engineered to deliver the timekeeping performance associated with high-frequency horology. Beating at 36,000 vibrations per hour, it represented a significant technical achievement for its era. The Ultra-Chron combined this mechanical sophistication with restrained designs that ranged from everyday steel watches to more refined precious-metal executions.

This example, reference 7826-1, presents the collection in a particularly elegant configuration. Its 18k gold case measures 36 mm across, offering a balanced presence while retaining the understated proportions characteristic of late-1960s dress watches. The glossy brown dial is the defining visual feature: its deep, warm tone complements the gold case and creates a rich, harmonious combination that stands apart from the more frequently encountered silver and champagne dials.

Inside, the automatic Longines calibre 431 operates at 36,000 vibrations per hour, while the brown pigskin strap reinforces the watch's understated vintage character. The serial number, in the 50-million range, suggests a production date around 1969–1970, subject to confirmation through Longines archives. This Ultra-Chron brings together an important chapter in the brand's precision-watchmaking history and an appealing combination of high-frequency engineering, precious metal and a glossy brown dial.