The first quartz watch wasn't unveiled until 1969. https://en.wikipedia.org/wiki/Quartz_clock https://en.wikipedia.org/wiki/Quartz_clock A high accuracy quart

The first quartz watch wasn't unveiled until 1969. https://en.wikipedia.org/wiki/Quartz_clock https://en.wikipedia.org/wiki/Quartz_clock A high accuracy quartz watch is accurate to 10 seconds per year. https://www.watchtime.com/featured/high-accuracy-quartz-guide-longines-vhp-breitling-bulova-citizen-chronomaster-omega-grand-seiko-9f/ https://www.watchtime.com/featured/high-accuracy-quartz-guid... However, railroad standard was 4 seconds daily. That means that if a high accuracy quartz watch is never checked it may fail the standard within a year. However, a less accurate railroad chronometer will always be checked because it is less accurate. https://en.wikipedia.org/wiki/Railroad_chronometer https://en.wikipedia.org/wiki/Railroad_chronometer