The phrase "like a Swiss watch" is correct and can be used in written English. This phrase is used to describe something that is very precise, accurate, and reliable. For example, "The IT department at my office works like a Swiss watch, always solving problems quickly and efficiently.".
"It was like a Swiss watch.
"It was working like a Swiss watch".
Gareth was like a Swiss watch.
— looks an awful lot like a Swiss watch.
The national pageant, founded here in 1934 as a tourism linchpin, employs a multilingual staff at an air-conditioned building in Parque de Bolívar in the old center, attracting sponsors like Edox, a Swiss watch manufacturer.
"Manufacturing a da Vinci is like building a Swiss watch," says Castello.
"Learning securitization is like learning the workings of a Swiss watch," Mr. Grais, a graduate of Yale Law School, said.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK