The Aztec design, inspired by patterns found on Aztec pyramids, was used on many other decorative pieces from the 1930s to the 1950s. An Aztec clock in working condition recently sold online for $843.

Collectors want unusual clocks, especially those with designs that used neon. The first neon sign was made in Paris in 1910. Neon did not come to the United States until 1923, when a Packard ...