It was not that affordable for everyone to own a watch in those old days. Therefore people were depend on the public time indicator, such as clock tower. Leech Street which has been busy and congested since long time ago is having no suitable place for a clock tower, And this old watch shop of Wing Kwong was doing publicity by offering the public a big clock in front of their shop. By looking at the style, this clock should have been telling time to the neighbourhood of Leech Street for more than 30 years and still operating accurately. Anyway I believe people nowadays would read time from their watch or even from mobile phone rather than looking to this clock.