The world’s first steam watch is in the historic Gastown district in central Vancouver, Canada. The street clock with dials on all four sides has a mechanical pendulum mechanism. This is driven by a paternoster and the weight of rotating balls. The balls are transported upwards by a steam engine inside the watch. The low-pressure water vapor comes from district heating in the district. The clock’s mechanism consists of five steam pipes, the largest of which - in the middle of the structure - plays on the hour. The four other pipes play the Westminster Quarters every quarter of an hour.

More details: https://en.wikipedia.org/wiki/Steam_clock