The first round dial tavern clocks in this format appeared around 1760-70. This fine example by William Stevens of Cirencester dates to about 1775. It has exceptional finely cut ears, roman and arabic numerals, a counterbalanced minute hand. The door has a concave top with fine chinoiserie which developed significantly as this format emerged as the doors are about twice the size of the earlier shield dials which had become unfashionable by this date. The dimensions are typical of the "standard design" with a height of 59 inches and a dial diameter of 30 inches.
Image courtesy of Carter Marsh & Co.