At the bottom of the clock was the detail that won the company the patent. There, a glass case with three cylinders rotated every five minutes to reveal a different advertisement for cigars, tailors, beverages, and furniture. Some clocks also featured sounds, such as bells or drums, as the cylinders turned.

The Sidney clocks were all long (between five to six feet tall), made of wood, and featured a white face. Many were calendar clocks and most (if not all) had movements made by Seth Thomas. Some had glass cases exposing the pendulum while others used that surface for additional advertising. The very top of the clock case featured either another advertisement or an ornamental, scalloped design.

The clock cases made by the Baird Clock Co. were much simpler in design, although they are still highly sought by collectors today. Founded in 1887 by Edward P. Baird, the company made clocks of wood and tin. Like the Sidney Advertising Clock Co., Baird clocks mostly used Seth Thomas movements.

The most common Baird advertising clocks look almost like a figure-eight. They feature a white face surrounded by a circular wood frame on top and a wooden circle underneath. The advertisement text is written on the wood. During the end of the 19th century, Baird’s clocks featured painted ads on the face.

Baird was also known for using papier-mâché and has been credited with creating the first Coca-Cola clocks in the 1890s.

Coca-Cola’s novelty timepieces ran the gamut from simple alarm clocks to elaborate neon wall clocks. According to some historians, Coca-Cola originally thought advertising via clocks was too expensive to be worthwhile on a large scale. But the clocks were a big hit with store owners, and by all accounts helped sell a lot of soda pop.

In addition to Baird, E.N. Welsh Co., Ingraham, and the William L. Gilbert Clock Co. created advertising clocks for Coca-Cola.

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