Mostly Harmless (1992)

The fifth Hitchhiker's Guide book by Douglas Adams. It's easy to get disheartened when your planet has been blown up and the woman you love has vanished due to a misunderstanding about space/time. Instead, Arthur Dent makes the terrible mistake of starting to enjoy life a bit, and immediately all hell breaks loose. (Goodreads)

Watches

Arthur Dent's moonphase watch: A gift from his stepfather, the mechanical moonphase keeps ticking through years of being stranded on a backwater planet.

Source text: Exact wording has not yet been verified. The readable publisher opening does not reach Arthur's watch; wording establishing the moonphase, the gift and its continued operation needs an edition locator.