All dumb, manual, HH:MM clocks, that is, unless the setter had patience and used a minute-crossing boundary to synchronize, reducing the error to ~1 second and resets them frequently to not drift more than a maximum of say 10 seconds. Most dumb clocks are likely to have an error of a minute or more because of cumulative drift and few people correct them until they are wildly wrong, say 5 minutes or more.

Or eschew the entire class of problem of daylight savings and drift with a GNSS- or radio time beacon-controlled clock.