Popularized between the 1930's and 60's advertising clocks come in a variety of different styles and sizes.  These clocks were originally designed as advertising pieces to be hung in or outside of shops to attract customers or to promote a certain company or product.  Many companies in the United States produced advertising clocks due to their huge popularity, and many "sign shops integrated these mass-produced clocks into larger metal signs and window displays." 

     Some of the advertising clocks produced were sold without any fancy names or logos on them, produced as "traffic stoppers" to attract the attention of people passing by the store.  Others had silk-screened graphics with names and logos, and the nicest clocks had the company's name or business spelled out in neon. 

     The Electric Neon Clock Company (EENC) was the largest manufacturer of advertising clocks, selling about 90% of all the clocks in the US.  One of their most popular options was the "chase wheel" which could have been added to a clock for an additional charge.  "Chase wheels were plastic disks, perforated metal wheels, or silk-screened glass panels that replaced the clock's second hand.  They rotated under a geometric design applied to the clock's glass or plastic cover.  This caused the neon light, sandwiched between two planes, to appear to race and spiral."

The information used to compile this article was found in Vintage Neon.