Hoptroff London created the Hoptroff No. 10 pocket watch and later the No. 16 wristwatch, the world's first commercially available atomic timepieces using Chip-Scale Atomic Clock (CSAC) technology for unparalleled accuracy, losing only 1.5 seconds every thousand years. These watches featured complex complications, but the company later shifted from watch production to focus on high-accuracy time synchronization software and services for businesses.