Ulysse Nardin San Marco Chronometer wristwatch with blue guilloche enamel dial. The original case was customized adding diamonds of approx a karat and a half all around it. Automatic, sapphire crystal, stainless steel case. Marked: Ulysse Nardin, San Marco, 133-77-9, 13423, Swiss Made. Ulysse Nardin SA is a Swiss luxury watchmaking company founded in 1846 in Switzerland. The company became known in the nautical world for manufacturing highly accurate marine chronometers and complicated timepieces used by over fifty of the world's navies from the end of the 19th century till 1950. The company today designs and manufactures luxury watches, dual-time watches, and marine chronometers, and sells its products through a network of distributors and several boutiques around the world. Authenticity Guarantee.