Although you might consider single-hand watches pretty unusual or unconventional considering that most of the timepieces around us have at least two hands, mechanical timekeeping started with clocks of this type.
Without needing to go back to sundials (it is not our intention to write a history of time here), when ingenious watchmakers produced the first mechanical clocks, they used just one hand to indicate the time of the day.
Until well into the eighteenth century tower clocks had only one hand, which showed the full hour or the quarter-hour. This was not a big issue. In fact, while measuring time was already very important, the pace of life was definitely less frenetic compared to our days.
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