You could talk about the tiny quartz crystal and the piezoelectric effect used to provide a stable time base for the electronic movement.
How long has the competitor taken to swim the 1,500 metre race?
But without reliable witnesses the accuracy of the watch makes no difference.
You can only establish the time for the race if it was timed by two or more qualified eyewitnesses who observed the start, the progress and the finish.
The influential American art patron Peggy Guggenheim bought the painting, believing it to be part of Léger's "Contraste de Formes" (Contrasts of Forms), an abstract series created between 19 that breaks up figures into schematic units.
(Léger was a contemporary of Pablo Picasso.) In the 1970s, Léger scholar Douglas Cooper voiced serious skepticism about its authenticity. Guggenheim Foundation, the current steward of the painting, has never exhibited nor catalogued the artwork.